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From ch...@apache.org
Subject [2/5] ignite git commit: IGNITE-8232: ML package cleanup for 2.5 release
Date Fri, 13 Apr 2018 15:08:17 GMT
http://git-wip-us.apache.org/repos/asf/ignite/blob/47cfdc27/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/ArtificialRegressionDatasets.java
----------------------------------------------------------------------
diff --git a/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/ArtificialRegressionDatasets.java b/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/ArtificialRegressionDatasets.java
deleted file mode 100644
index ed6bf36..0000000
--- a/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/ArtificialRegressionDatasets.java
+++ /dev/null
@@ -1,404 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.ignite.ml.regressions.linear;
-
-/**
- * Artificial regression datasets to be used in regression trainers tests. These datasets were generated by scikit-learn
- * tools, {@code sklearn.datasets.make_regression} procedure.
- */
-public class ArtificialRegressionDatasets {
-    /**
-     * Artificial dataset with 10 observations described by 1 feature.
-     */
-    public static final TestDataset regression10x1 = new TestDataset(new double[][] {
-        {1.97657990214, 0.197725444973},
-        {-5.0835948878, -0.279921224228},
-        {-5.09032600779, -0.352291245969},
-        {9.67660993007, 0.755464872441},
-        {4.95927629958, 0.451981771462},
-        {29.2635107429, 2.2277440173},
-        {-18.3122588459, -1.25363275369},
-        {-3.61729307199, -0.273362913982},
-        {-7.19042139249, -0.473846634967},
-        {3.68008403347, 0.353883097536}
-    }, new double[] {13.554054703}, -0.808655936776);
-
-    /**
-     * Artificial dataset with 10 observations described by 5 features.
-     */
-    public static final TestDataset regression10x5 = new TestDataset(new double[][] {
-        {118.635647237, 0.687593385888, -1.18956185502, -0.305420702986, 1.98794097418, -0.776629036361},
-        {-18.2808432286, -0.165921853684, -0.156162539573, 1.56284391134, -0.198876782109, -0.0921618505605},
-        {22.6110523992, 0.0268106268606, 0.702141470035, -0.41503615392, -1.09726502337, 1.30830482813},
-        {209.820435262, 0.379809113402, -0.192097238579, -1.27460497119, 2.48052002019, -0.574430888865},
-        {-253.750024054, -1.48044570917, -0.331747484523, 0.387993627712, 0.372583756237, -2.27404065923},
-        {-24.6467766166, -0.66991474156, 0.269042238935, -0.271412703096, -0.561166818525, 1.37067541854},
-        {-311.903650717, 0.268274438122, -1.10491275353, -1.06738703543, -2.24387799735, -0.207431467989},
-        {74.2055323536, -0.329489531894, -0.493350762533, -0.644851462227, 0.661220945573, 1.65950140864},
-        {57.0312289904, -1.07266578457, 0.80375035572, -0.45207210139, 1.69314420969, -1.10526080856},
-        {12.149399645, 1.46504629281, -1.05843246079, 0.266225365277, -0.0113100353869, -0.983495425471}
-    }, new double[] {99.8393653561, 82.4948224094, 20.2087724072, 97.3306384162, 55.7502297387}, 3.98444039189);
-
-    /**
-     * Artificial dataset with 100 observations described by 5 features.
-     */
-    public static final TestDataset regression100x5 = new TestDataset(new double[][] {
-        {-44.2310642946, -0.0331360137605, -0.5290800706, -0.634340342338, -0.428433927151, 0.830582347183},
-        {76.2539139721, -0.216200869652, 0.513212019048, -0.693404511747, 0.132995973133, 1.28470259833},
-        {293.369799914, 2.90735870802, 0.457740818846, -0.490470696097, -0.442343455187, 0.584038258781},
-        {124.258807314, 1.64158129148, 0.0616936820145, 1.24082841519, -1.20126518593, -0.542298907742},
-        {13.6610807249, -1.10834821778, 0.545508208111, 1.81361288715, -0.786543112444, 0.250772626496},
-        {101.924582305, -0.433526394969, 0.257594734335, 1.22333193911, 0.76626554927, -0.0400734567005},
-        {25.5963186303, -0.202003301507, 0.717101151637, -0.486881225605, 1.15215024807, -0.921615554612},
-        {75.7959681263, -0.604173187402, 0.0364386836472, 1.67544714536, 0.394743148877, 0.0237966550759},
-        {-97.539357166, -0.774517689169, -0.0966902473883, -0.152250704254, -0.325472625458, 0.0720711851256},
-        {0.394748999236, -0.559303402754, -0.0493339259273, -1.10840277768, -0.0800969523557, 1.80939282066},
-        {-62.0138166431, 0.062614716778, -0.844143618016, 0.55269949861, -2.32580899335, 1.58020577369},
-        {584.427692931, 2.13184767906, 1.22222461994, 1.71894070494, 2.69512281718, 0.294123497874},
-        {-59.8323709765, 1.00006112818, -1.54481230765, -0.781282316493, 0.0255925284853, -0.0821173744608},
-        {101.565711925, -0.38699836725, 1.06934591441, -0.260429311097, 1.02628949564, 0.0431473245174},
-        {-141.592607814, 0.993279116267, -0.371768203378, -0.851483217286, -1.96241293548, -0.612279404296},
-        {34.8038723379, -0.0182719243972, 0.306367604506, -0.650526589206, 1.30693112283, -0.587465952557},
-        {-16.9554534069, -0.703006786668, -0.770718401931, 0.748423272307, 0.502544067819, 0.346625621533},
-        {-76.2896177709, -0.16440174812, -1.77431555198, 0.195326723837, 2.01240994405, -1.19559207119},
-        {-3.23827624818, -0.674138419631, -1.62238580284, 2.02235607862, 0.679194838679, 0.150203732584},
-        {-21.962456854, -0.766271014206, 0.958599712131, -0.313045794728, 0.232655576106, -0.360950549871},
-        {349.583669646, 1.75976166947, 1.47271612346, 0.0346005603489, 0.474907228495, 0.61379496381},
-        {-418.397356757, -1.83395936566, -0.911702678716, -0.532478094882, -2.03835348133, -0.423005552518},
-        {55.0298153952, -0.0301384716096, -0.0137929430966, -0.348583692759, 0.986486580719, 0.154436524434},
-        {127.150063206, 1.92682560465, -0.434844790414, 0.1082898967, -0.00723338222402, -0.513199251824},
-        {89.6172507626, 1.02463790902, 0.744369837717, 1.250323683, -1.58252612128, -0.588242778808},
-        {92.5124829355, -0.403298547743, 0.0422774545428, -0.175000467434, 1.61110066857, 0.422330077287},
-        {-303.040366788, 0.611569308879, -1.21926246291, -2.49250330276, -0.789166929605, -1.30166501196},
-        {-17.4020602839, 1.72337202371, -1.83540537288, 0.731588761841, -0.338642535062, -1.11053518125},
-        {114.918701324, 0.437385758628, 0.975885170381, 0.439444038872, 1.51666514156, -1.93095020264},
-        {-8.43548064928, -0.799507968686, -0.00842968328782, -0.154994093964, 1.09169753491, -0.0114818657732},
-        {109.209286025, 2.56472965015, -2.07047248035, -0.46764001177, 0.845267147375, -0.236767841427},
-        {61.5259982971, -0.379391870148, -0.131017762354, -0.220275015864, 1.82097825699, -0.0568354876403},
-        {-71.3872099588, 0.642138455414, -1.00242489879, 0.536780074488, 0.350977275771, -1.8204862883},
-        {-21.2768078629, -0.454268998895, 0.0992324274219, 0.0363496803224, 0.281940751723, -0.198435570828},
-        {-8.07838891387, -0.331642089041, -0.494067341253, 0.386035842816, -0.738221128298, 1.18236299649},
-        {30.4818041751, 0.099206096537, 0.150688905006, 0.332932621949, 0.194845631964, -0.446717875795},
-        {237.209150991, 1.12560447042, 0.448488431264, -0.724623711259, 0.401868257097, 1.67129001163},
-        {185.172816475, 0.36594142556, -0.0796476435741, 0.473836257, 1.30890722633, 0.592415068693},
-        {19.8830237044, 1.52497319332, 0.466906090264, -0.716635613964, -1.19532276745, -0.697663531684},
-        {209.396793626, 0.368478789658, 0.699162303982, 1.96702434462, -0.815379139879, 0.863369634396},
-        {-215.100514168, -1.83902416164, -1.14966820385, -1.01044860587, 1.76881340629, -0.32165916241},
-        {-33.4687353426, -0.0451102002703, 0.642212950033, 0.580822065219, -1.02341504063, -0.781229325942},
-        {150.251474823, 0.220170650298, 0.224858901011, 0.541299425328, 1.15151550963, 0.0329044069571},
-        {92.2160506097, 1.86450932451, -0.991150940533, -1.49137866968, 1.02113774105, 0.0544762857136},
-        {41.2138467595, -0.778892265105, 0.714957464344, 1.79833618993, -0.335322825621, -0.397548301803},
-        {13.151262759, 0.301745607362, 0.129778280739, 0.260094818273, -0.10587841585, -0.599330307629},
-        {-367.864703951, -1.68695981263, -0.611957677512, -0.0362971579679, -1.2169760515, -1.43224375134},
-        {-57.218869838, 0.428806849751, 0.654302177028, -1.31651788496, 0.363857431276, -1.49953703016},
-        {53.0877462955, -0.411907760185, -0.192634094071, -0.275879375023, 0.603562526571, 1.16508196734},
-        {-8.11860742896, 1.00263982158, -0.157031169267, -1.11795623393, 0.35711440521, -0.851124640982},
-        {-49.1878248403, -0.0253797866589, -0.574767070714, 0.200339045636, -0.0107042446803, -0.351288977927},
-        {-73.8835407053, -2.07980276724, 1.12235566491, -0.917150593536, 0.741384768556, 0.56229424235},
-        {143.163604045, 0.33627769945, 1.07948757447, 0.894869929963, 1.18688316974, -1.54722487849},
-        {92.7045830908, 0.944091525689, 0.693296229491, 0.700097596814, -1.23666276942, -0.203890113084},
-        {79.1878852355, -0.221973023853, -0.566066329011, 1.57683748648, 0.52854717911, 0.147924782476},
-        {30.6547392801, -1.03466213359, 0.606784904328, -0.298096511956, 0.83332987683, 0.636339018254},
-        {-329.128386019, -1.41363866598, -1.34966434823, -0.989010564149, 0.46889477248, -1.20493210784},
-        {121.190205512, 0.0393914245697, 1.98392444232, -0.65310705226, -0.385899987099, 0.444982471471},
-        {-97.0333075649, 0.264325871992, -0.43074811924, -1.14737761316, -0.453134140655, -0.038507405311},
-        {158.273624516, 0.302255432981, -0.292046617818, 1.0704087606, 0.815965268115, 0.470631083546},
-        {8.24795061818, -1.15155524496, 1.29538707184, -0.4650881541, 0.805123486308, -0.134706887329},
-        {87.1140049059, -0.103540823781, -0.192259440773, 1.79648860085, -1.07525447993, 1.06985127941},
-        {-25.1300772481, -0.97140742052, 0.033393948794, -0.698311192672, 0.74417168942, 0.752776770225},
-        {-285.477057638, -0.480612406803, -1.46081500036, -1.92518386336, -0.426454066275, -0.0539099489597},
-        {-65.1269988498, -1.22733468764, 0.121538452336, 0.752958777557, -0.40643211762, 0.257674949803},
-        {-17.1813504942, 0.823753836891, 0.445142465255, 0.185644700144, -1.99733367514, -0.247899323048},
-        {-46.7543447303, 0.183482778928, -0.934858705943, -1.21961947396, 0.460921844744, 0.571388077177},
-        {-1.7536190499, -0.107517908181, 0.0334282610968, -0.556676121428, -0.485957577159, 0.943570398164},
-        {-42.8460452689, 0.944999215632, 0.00530052154909, -0.348526283976, -1.724125354, -0.122649339813},
-        {62.6291497267, 0.249619894002, 1.3139125969, -1.5644227783, 0.117605482783, 0.304844650662},
-        {97.4552176343, 1.59332799639, -1.17868305562, 1.02998378902, -0.31959491258, -0.183038322076},
-        {-6.19358885758, 0.437951016253, 0.373339269494, -0.204072768495, 0.477969349931, -1.52176449389},
-        {34.0350630099, 0.839319087287, -0.610157662489, 1.73881448393, -1.89200107709, 0.204946415522},
-        {54.9790822536, -0.191792583114, 0.989791127554, -0.502154080064, 0.469939512389, -0.102304071079},
-        {58.8272402843, 0.0769623906454, 0.501297284297, -0.410054999243, 0.595712387781, -0.0968329050729},
-        {95.3620983209, 0.0661481959314, 0.0935137309086, 1.11823292347, -0.612960777903, 0.767865072757},
-        {62.4278196648, 0.78350610065, -1.09977017652, 0.526824784479, 1.41310104196, -0.887902707319},
-        {57.6298676729, 0.60084172954, -0.785932027202, 0.0271301584637, -0.134109499719, 0.877256170191},
-        {5.14112905382, -0.738359365006, 1.40242539359, -0.852833010305, -0.68365080837, 0.88561193696},
-        {11.6057244034, -0.958911227571, 1.15715937023, 1.20108425431, 0.882980929338, -1.77404120156},
-        {-265.758185272, -1.2092434823, -0.0550151798639, 0.00703735243613, -1.01767244359, -1.40616581707},
-        {180.625928828, -0.139091127126, 0.243250756129, 2.17509702585, -0.541735827898, 1.2109459934},
-        {-183.604103216, -0.324555097769, -1.71317286749, 1.03645005723, 0.497569347608, -1.96688185911},
-        {9.93237328848, 0.825483591345, 0.910287997312, -1.64938108528, 0.98964075968, -1.65748940528},
-        {-88.6846949813, -0.0759295112746, -0.593311990101, -0.578711915019, 0.256298822361, -0.429322890198},
-        {175.367391479, 0.9361754906, -0.0172852897292, 1.04078658833, 0.919566407184, -0.554923019093},
-        {-175.538247146, -1.43498590417, 0.37233438556, -0.897205352198, -0.339309952316, -0.0321624527843},
-        {-126.331680318, 0.160446617623, 0.816642363249, -1.39863371652, 0.199747744327, -2.13493607457},
-        {116.677107593, 1.19300905847, -0.404409346893, 0.646338976096, -0.534204093869, 0.36692724765},
-        {-181.675962893, -1.57613169533, -0.41549571451, -0.956673746013, 0.35723782515, 0.318317395128},
-        {-55.1457877823, 0.63723030991, -0.324480386466, 0.296028333894, -1.68117515658, -0.131945601375},
-        {25.2534791013, 0.594818219911, -0.0247380403547, -0.101492246071, -0.0745619242015, -0.370837128867},
-        {63.6006283756, -1.53493473818, 0.946464097439, 0.637741397831, 0.938866921166, 0.54405291856},
-        {-69.6245547661, 0.328482934094, -0.776881060846, -0.285133098443, -1.06107824512, 0.49952182341},
-        {233.425957233, 3.10582399189, -0.0854710508706, 0.455873479133, -0.0974589364949, -1.18914783551},
-        {-86.5564290626, -0.819839276484, 0.584745927593, -0.544737106102, -1.21927675581, 0.758502626434},
-        {425.357285631, 1.70712253847, 1.19892647853, 1.60619661301, 0.36832665241, 0.880791322709},
-        {111.797225426, 0.558940594145, -0.746492420236, 1.90172101792, 0.853590062366, -0.867970723941},
-        {-253.616801014, -0.426513440051, 0.0388582291888, -1.18576061365, -2.70895868242, 0.26982210287},
-        {-394.801501024, -1.65087241498, 0.735525201393, -2.02413077052, -0.96492749037, -1.89014065613}
-    }, new double[] {93.3843533037, 72.3610889215, 57.5295295915, 63.7287541653, 65.2263084024}, 6.85683020686);
-
-    /**
-     * Artificial dataset with 100 observations described by 10 features.
-     */
-    public static final TestDataset regression100x10 = new TestDataset(new double[][] {
-        {69.5794204114, -0.684238565877, 0.175665643732, 0.882115894035, 0.612844187624,
-            -0.685301720572, -0.8266500007, -0.0383407025118, 1.7105205222, 0.457436379836, -0.291563926494},
-        {80.1390102826, -1.80708821811, 0.811271788195, 0.30248512861, 0.910658009566,
-            -1.61869762501, -0.148325085362, -0.0714164596509, 0.671646742271, 2.15160094956, -0.0495754979721},
-        {-156.975447515, 0.170702943934, -0.973403372054, -0.093974528453, 1.54577255871,
-            -0.0969022857972, -1.10639617368, 1.51752480948, -2.86016865032, 1.24063030602, -0.521785751026},
-        {-158.134931891, 0.0890071395055, -0.0811824442353, -0.737354274843, -1.7575255492,
-            0.265777246641, 0.0745347238144, -0.457603542683, -1.37034043839, 1.86011799875, 0.651214189491},
-        {-131.465820263, 0.0767565260375, 0.651724194978, 0.142113799753, 0.244367469855,
-            -0.334395162837, -0.069092305876, -0.691806779713, -1.28386786177, -1.43647491141, 0.00721053414234},
-        {-125.468890054, 0.43361925912, -0.800231440065, -0.576001094593, 0.0783664516431,
-            -1.33613252233, -0.968385062126, -1.22077801286, 0.193456109638, -3.09372314386, 0.817979620215},
-        {-44.1113403874, -0.595796803171, 1.29482131972, -0.784513985654, 0.364702038003,
-            -3.2452492093, -0.451605560847, 0.988546607514, 0.492096628873, -0.343018842342, -0.519231306954},
-        {61.2269707872, -0.0289059337716, -1.00409238976, 0.329908621635, 1.41965097539,
-            0.0395065997587, -0.477939549336, 0.842336765911, -0.808790019648, 1.70241718768, -0.117194118865},
-        {301.434286126, 0.430005308515, 1.01290089725, -0.228221561554, 0.463405921629,
-            -0.602413489517, 1.13832440088, 0.930949226185, -0.196440161506, 1.46304624346, 1.23831509056},
-        {-270.454814681, -1.43805412632, -0.256309572507, -0.358047601174, 0.265151660237,
-            1.07087986377, -1.93784654681, -0.854440691754, 0.665691996289, -1.87508012738, -0.387092423365},
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-        {-81.9954096721, 0.594841146008, -1.22273253129, 0.532466794358, 1.69864239257,
-            -0.12293671327, -2.06645974171, 0.611808231703, -1.32291985291, 0.722066660478, -0.0021343848511},
-        {-245.715046329, -1.77850303496, -0.176518810079, 1.20463434525, -0.597826204963,
-            -1.45842350123, -0.765730251727, -2.17764204443, 0.12996635702, -0.705509516482, 0.170639846082},
-        {123.011946043, -0.909707162714, 0.92357208515, 0.373251929121, 1.24629576577,
-            0.0662688299998, -0.372240547929, -0.739353735168, 0.323495756066, 0.954154005738, 0.69606859977},
-        {-70.4564963177, 0.650682297051, 0.378131376232, 1.37860253614, -0.924042783872,
-            0.802851073842, -0.450299927542, 0.235646185302, -0.148779896161, 1.01308126122, -0.48206889502},
-        {21.5288687935, 0.290876355386, 0.0765702960599, 0.905225489744, 0.252841861521,
-            1.26729272819, 0.315397441908, -2.00317261368, -0.250990653758, 0.425615332405, 0.0875320802483},
-        {231.370169905, 0.535138021352, -1.07151617232, 0.824383756287, 1.84428896701,
-            -0.890892034494, 0.0480296332924, -0.59251208055, 0.267564961845, -0.230698441998, 0.857077278291},
-        {38.8318274023, 2.63547217711, -0.585553060394, 0.430550920323, -0.532619160993,
-            1.25335488136, -1.65265278435, 0.0433880112291, -0.166143379872, 0.534066441314, 1.18929937797},
-        {116.362219013, -0.275949982433, 0.468069787645, -0.879814121059, 0.862799331322,
-            1.18464846725, 0.747084253268, 1.39202500691, -1.23374181275, 0.0949815110503, 0.696546907194},
-        {260.540154731, 1.13798788241, -0.0991903174656, 0.1241636043, -0.201415073037,
-            1.57683389508, 1.81535629587, 1.07873616646, -0.355800782882, 2.18333193195, 0.0711071144615},
-        {-165.835194521, -2.76613178307, 0.805314338858, 0.81526046683, -0.710489036197,
-            -1.20189542317, -0.692110074722, -0.117239516622, 1.0431459458, -0.111898596299, -0.0775811519297},
-        {-341.189958588, 0.668555635008, -1.0940034941, -0.497881262778, -0.603682823779,
-            -0.396875163796, -0.849144848521, 0.403936807183, -1.82076277475, -0.137500972546, -1.22769896568}
-    }, new double[] {45.8685095528, 11.9400336005, 16.3984976652, 79.9069814034, 5.65486853464,
-        83.6427296424, 27.4571268153, 73.5881193584, 27.1465364511, 79.4095449062}, -5.14077007134);
-
-    /** */
-    public static class TestDataset {
-
-        /** */
-        private final double[][] data;
-
-        /** */
-        private final double[] expWeights;
-
-        /** */
-        private final double expIntercept;
-
-        /** */
-        TestDataset(double[][] data, double[] expWeights, double expIntercept) {
-            this.data = data;
-            this.expWeights = expWeights;
-            this.expIntercept = expIntercept;
-        }
-
-        /** */
-        public double[][] getData() {
-            return data;
-        }
-
-        /** */
-        public double[] getExpWeights() {
-            return expWeights;
-        }
-
-        /** */
-        public double getExpIntercept() {
-            return expIntercept;
-        }
-    }
-}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/ignite/blob/47cfdc27/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/BlockDistributedLinearRegressionQRTrainerTest.java
----------------------------------------------------------------------
diff --git a/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/BlockDistributedLinearRegressionQRTrainerTest.java b/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/BlockDistributedLinearRegressionQRTrainerTest.java
deleted file mode 100644
index 0c09d75..0000000
--- a/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/BlockDistributedLinearRegressionQRTrainerTest.java
+++ /dev/null
@@ -1,36 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.ignite.ml.regressions.linear;
-
-import org.apache.ignite.ml.math.impls.matrix.SparseBlockDistributedMatrix;
-import org.apache.ignite.ml.math.impls.vector.SparseBlockDistributedVector;
-
-/**
- * Tests for {@link LinearRegressionQRTrainer} on {@link SparseBlockDistributedMatrix}.
- */
-public class BlockDistributedLinearRegressionQRTrainerTest extends GridAwareAbstractLinearRegressionTrainerTest {
-    /** */
-    public BlockDistributedLinearRegressionQRTrainerTest() {
-        super(
-            new LinearRegressionQRTrainer(),
-            SparseBlockDistributedMatrix::new,
-            SparseBlockDistributedVector::new,
-            1e-6
-        );
-    }
-}

http://git-wip-us.apache.org/repos/asf/ignite/blob/47cfdc27/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/DistributedLinearRegressionQRTrainerTest.java
----------------------------------------------------------------------
diff --git a/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/DistributedLinearRegressionQRTrainerTest.java b/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/DistributedLinearRegressionQRTrainerTest.java
deleted file mode 100644
index 2a506d9..0000000
--- a/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/DistributedLinearRegressionQRTrainerTest.java
+++ /dev/null
@@ -1,36 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.ignite.ml.regressions.linear;
-
-import org.apache.ignite.ml.math.impls.matrix.SparseDistributedMatrix;
-import org.apache.ignite.ml.math.impls.vector.SparseDistributedVector;
-
-/**
- * Tests for {@link LinearRegressionQRTrainer} on {@link SparseDistributedMatrix}.
- */
-public class DistributedLinearRegressionQRTrainerTest extends GridAwareAbstractLinearRegressionTrainerTest {
-    /** */
-    public DistributedLinearRegressionQRTrainerTest() {
-        super(
-            new LinearRegressionQRTrainer(),
-            SparseDistributedMatrix::new,
-            SparseDistributedVector::new,
-            1e-6
-        );
-    }
-}

http://git-wip-us.apache.org/repos/asf/ignite/blob/47cfdc27/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/GenericLinearRegressionTrainerTest.java
----------------------------------------------------------------------
diff --git a/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/GenericLinearRegressionTrainerTest.java b/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/GenericLinearRegressionTrainerTest.java
deleted file mode 100644
index a55623c..0000000
--- a/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/GenericLinearRegressionTrainerTest.java
+++ /dev/null
@@ -1,206 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.ignite.ml.regressions.linear;
-
-import java.util.Scanner;
-import org.apache.ignite.ml.TestUtils;
-import org.apache.ignite.ml.Trainer;
-import org.apache.ignite.ml.math.Matrix;
-import org.apache.ignite.ml.math.Vector;
-import org.apache.ignite.ml.math.functions.IgniteFunction;
-import org.junit.Test;
-
-/**
- * Base class for all linear regression trainers.
- */
-public class GenericLinearRegressionTrainerTest {
-    /** */
-    private final Trainer<LinearRegressionModel, Matrix> trainer;
-
-    /** */
-    private final IgniteFunction<double[][], Matrix> matrixCreator;
-
-    /** */
-    private final IgniteFunction<double[], Vector> vectorCreator;
-
-    /** */
-    private final double precision;
-
-    /** */
-    public GenericLinearRegressionTrainerTest(
-        Trainer<LinearRegressionModel, Matrix> trainer,
-        IgniteFunction<double[][], Matrix> matrixCreator,
-        IgniteFunction<double[], Vector> vectorCreator,
-        double precision) {
-        this.trainer = trainer;
-        this.matrixCreator = matrixCreator;
-        this.vectorCreator = vectorCreator;
-        this.precision = precision;
-    }
-
-    /**
-     * Test trainer on regression model y = 2 * x.
-     */
-    @Test
-    public void testTrainWithoutIntercept() {
-        Matrix data = matrixCreator.apply(new double[][] {
-            {2.0, 1.0},
-            {4.0, 2.0}
-        });
-
-        LinearRegressionModel mdl = trainer.train(data);
-
-        TestUtils.assertEquals(4, mdl.apply(vectorCreator.apply(new double[] {2})), precision);
-        TestUtils.assertEquals(6, mdl.apply(vectorCreator.apply(new double[] {3})), precision);
-        TestUtils.assertEquals(8, mdl.apply(vectorCreator.apply(new double[] {4})), precision);
-    }
-
-    /**
-     * Test trainer on regression model y = -1 * x + 1.
-     */
-    @Test
-    public void testTrainWithIntercept() {
-        Matrix data = matrixCreator.apply(new double[][] {
-            {1.0, 0.0},
-            {0.0, 1.0}
-        });
-
-        LinearRegressionModel mdl = trainer.train(data);
-
-        TestUtils.assertEquals(0.5, mdl.apply(vectorCreator.apply(new double[] {0.5})), precision);
-        TestUtils.assertEquals(2, mdl.apply(vectorCreator.apply(new double[] {-1})), precision);
-        TestUtils.assertEquals(-1, mdl.apply(vectorCreator.apply(new double[] {2})), precision);
-    }
-
-    /**
-     * Test trainer on diabetes dataset.
-     */
-    @Test
-    public void testTrainOnDiabetesDataset() {
-        Matrix data = loadDataset("datasets/regression/diabetes.csv", 442, 10);
-
-        LinearRegressionModel mdl = trainer.train(data);
-
-        Vector expWeights = vectorCreator.apply(new double[] {
-            -10.01219782, -239.81908937, 519.83978679, 324.39042769, -792.18416163,
-            476.74583782, 101.04457032, 177.06417623, 751.27932109, 67.62538639
-        });
-
-        double expIntercept = 152.13348416;
-
-        TestUtils.assertEquals("Wrong weights", expWeights, mdl.getWeights(), precision);
-        TestUtils.assertEquals("Wrong intercept", expIntercept, mdl.getIntercept(), precision);
-    }
-
-    /**
-     * Test trainer on boston dataset.
-     */
-    @Test
-    public void testTrainOnBostonDataset() {
-        Matrix data = loadDataset("datasets/regression/boston.csv", 506, 13);
-
-        LinearRegressionModel mdl = trainer.train(data);
-
-        Vector expWeights = vectorCreator.apply(new double[] {
-            -1.07170557e-01, 4.63952195e-02, 2.08602395e-02, 2.68856140e+00, -1.77957587e+01, 3.80475246e+00,
-            7.51061703e-04, -1.47575880e+00, 3.05655038e-01, -1.23293463e-02, -9.53463555e-01, 9.39251272e-03,
-            -5.25466633e-01
-        });
-
-        double expIntercept = 36.4911032804;
-
-        TestUtils.assertEquals("Wrong weights", expWeights, mdl.getWeights(), precision);
-        TestUtils.assertEquals("Wrong intercept", expIntercept, mdl.getIntercept(), precision);
-    }
-
-    /**
-     * Tests trainer on artificial dataset with 10 observations described by 1 feature.
-     */
-    @Test
-    public void testTrainOnArtificialDataset10x1() {
-        ArtificialRegressionDatasets.TestDataset dataset = ArtificialRegressionDatasets.regression10x1;
-
-        LinearRegressionModel mdl = trainer.train(matrixCreator.apply(dataset.getData()));
-
-        TestUtils.assertEquals("Wrong weights", dataset.getExpWeights(), mdl.getWeights(), precision);
-        TestUtils.assertEquals("Wrong intercept", dataset.getExpIntercept(), mdl.getIntercept(), precision);
-    }
-
-    /**
-     * Tests trainer on artificial dataset with 10 observations described by 5 features.
-     */
-    @Test
-    public void testTrainOnArtificialDataset10x5() {
-        ArtificialRegressionDatasets.TestDataset dataset = ArtificialRegressionDatasets.regression10x5;
-
-        LinearRegressionModel mdl = trainer.train(matrixCreator.apply(dataset.getData()));
-
-        TestUtils.assertEquals("Wrong weights", dataset.getExpWeights(), mdl.getWeights(), precision);
-        TestUtils.assertEquals("Wrong intercept", dataset.getExpIntercept(), mdl.getIntercept(), precision);
-    }
-
-    /**
-     * Tests trainer on artificial dataset with 100 observations described by 5 features.
-     */
-    @Test
-    public void testTrainOnArtificialDataset100x5() {
-        ArtificialRegressionDatasets.TestDataset dataset = ArtificialRegressionDatasets.regression100x5;
-
-        LinearRegressionModel mdl = trainer.train(matrixCreator.apply(dataset.getData()));
-
-        TestUtils.assertEquals("Wrong weights", dataset.getExpWeights(), mdl.getWeights(), precision);
-        TestUtils.assertEquals("Wrong intercept", dataset.getExpIntercept(), mdl.getIntercept(), precision);
-    }
-
-    /**
-     * Tests trainer on artificial dataset with 100 observations described by 10 features.
-     */
-    @Test
-    public void testTrainOnArtificialDataset100x10() {
-        ArtificialRegressionDatasets.TestDataset dataset = ArtificialRegressionDatasets.regression100x10;
-
-        LinearRegressionModel mdl = trainer.train(matrixCreator.apply(dataset.getData()));
-
-        TestUtils.assertEquals("Wrong weights", dataset.getExpWeights(), mdl.getWeights(), precision);
-        TestUtils.assertEquals("Wrong intercept", dataset.getExpIntercept(), mdl.getIntercept(), precision);
-    }
-
-    /**
-     * Loads dataset file and returns corresponding matrix.
-     *
-     * @param fileName Dataset file name
-     * @param nobs Number of observations
-     * @param nvars Number of features
-     * @return Data matrix
-     */
-    private Matrix loadDataset(String fileName, int nobs, int nvars) {
-        double[][] matrix = new double[nobs][nvars + 1];
-        Scanner scanner = new Scanner(this.getClass().getClassLoader().getResourceAsStream(fileName));
-        int i = 0;
-        while (scanner.hasNextLine()) {
-            String row = scanner.nextLine();
-            int j = 0;
-            for (String feature : row.split(",")) {
-                matrix[i][j] = Double.parseDouble(feature);
-                j++;
-            }
-            i++;
-        }
-        return matrixCreator.apply(matrix);
-    }
-}

http://git-wip-us.apache.org/repos/asf/ignite/blob/47cfdc27/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/GridAwareAbstractLinearRegressionTrainerTest.java
----------------------------------------------------------------------
diff --git a/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/GridAwareAbstractLinearRegressionTrainerTest.java b/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/GridAwareAbstractLinearRegressionTrainerTest.java
deleted file mode 100644
index 9b75bd4..0000000
--- a/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/GridAwareAbstractLinearRegressionTrainerTest.java
+++ /dev/null
@@ -1,127 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.ignite.ml.regressions.linear;
-
-import org.apache.ignite.Ignite;
-import org.apache.ignite.internal.util.IgniteUtils;
-import org.apache.ignite.ml.Trainer;
-import org.apache.ignite.ml.math.Matrix;
-import org.apache.ignite.ml.math.Vector;
-import org.apache.ignite.ml.math.functions.IgniteFunction;
-import org.apache.ignite.testframework.junits.common.GridCommonAbstractTest;
-import org.junit.Test;
-
-/**
- * Grid aware abstract linear regression trainer test.
- */
-public abstract class GridAwareAbstractLinearRegressionTrainerTest extends GridCommonAbstractTest {
-    /** Number of nodes in grid */
-    private static final int NODE_COUNT = 3;
-
-    /**
-     * Delegate actually performs tests.
-     */
-    private final GenericLinearRegressionTrainerTest delegate;
-
-    /** */
-    private Ignite ignite;
-
-    /** */
-    public GridAwareAbstractLinearRegressionTrainerTest(
-        Trainer<LinearRegressionModel, Matrix> trainer,
-        IgniteFunction<double[][], Matrix> matrixCreator,
-        IgniteFunction<double[], Vector> vectorCreator,
-        double precision) {
-        delegate = new GenericLinearRegressionTrainerTest(trainer, matrixCreator, vectorCreator, precision);
-    }
-
-    /** {@inheritDoc} */
-    @Override protected void beforeTestsStarted() throws Exception {
-        for (int i = 1; i <= NODE_COUNT; i++)
-            startGrid(i);
-    }
-
-    /** {@inheritDoc} */
-    @Override protected void afterTestsStopped() {
-        stopAllGrids();
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    @Override protected void beforeTest() throws Exception {
-        /* Grid instance. */
-        ignite = grid(NODE_COUNT);
-        ignite.configuration().setPeerClassLoadingEnabled(true);
-        IgniteUtils.setCurrentIgniteName(ignite.configuration().getIgniteInstanceName());
-    }
-
-    /**
-     * Test trainer on regression model y = 2 * x.
-     */
-    @Test
-    public void testTrainWithoutIntercept() {
-        IgniteUtils.setCurrentIgniteName(ignite.configuration().getIgniteInstanceName());
-        delegate.testTrainWithoutIntercept();
-    }
-
-    /**
-     * Test trainer on regression model y = -1 * x + 1.
-     */
-    @Test
-    public void testTrainWithIntercept() {
-        IgniteUtils.setCurrentIgniteName(ignite.configuration().getIgniteInstanceName());
-        delegate.testTrainWithIntercept();
-    }
-
-    /**
-     * Tests trainer on artificial dataset with 10 observations described by 1 feature.
-     */
-    @Test
-    public void testTrainOnArtificialDataset10x1() {
-        IgniteUtils.setCurrentIgniteName(ignite.configuration().getIgniteInstanceName());
-        delegate.testTrainOnArtificialDataset10x1();
-    }
-
-    /**
-     * Tests trainer on artificial dataset with 10 observations described by 5 features.
-     */
-    @Test
-    public void testTrainOnArtificialDataset10x5() {
-        IgniteUtils.setCurrentIgniteName(ignite.configuration().getIgniteInstanceName());
-        delegate.testTrainOnArtificialDataset10x5();
-    }
-
-    /**
-     * Tests trainer on artificial dataset with 100 observations described by 5 features.
-     */
-    @Test
-    public void testTrainOnArtificialDataset100x5() {
-        IgniteUtils.setCurrentIgniteName(ignite.configuration().getIgniteInstanceName());
-        delegate.testTrainOnArtificialDataset100x5();
-    }
-
-    /**
-     * Tests trainer on artificial dataset with 100 observations described by 10 features.
-     */
-    @Test
-    public void testTrainOnArtificialDataset100x10() {
-        IgniteUtils.setCurrentIgniteName(ignite.configuration().getIgniteInstanceName());
-        delegate.testTrainOnArtificialDataset100x10();
-    }
-}

http://git-wip-us.apache.org/repos/asf/ignite/blob/47cfdc27/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/LinearRegressionSGDTrainerTest.java
----------------------------------------------------------------------
diff --git a/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/LinearRegressionSGDTrainerTest.java b/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/LinearRegressionSGDTrainerTest.java
index fa8fac4..c62cca5 100644
--- a/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/LinearRegressionSGDTrainerTest.java
+++ b/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/LinearRegressionSGDTrainerTest.java
@@ -19,7 +19,7 @@ package org.apache.ignite.ml.regressions.linear;
 
 import org.apache.ignite.ml.optimization.updatecalculators.RPropParameterUpdate;
 import org.apache.ignite.ml.optimization.updatecalculators.RPropUpdateCalculator;
-import org.apache.ignite.ml.trainers.group.UpdatesStrategy;
+import org.apache.ignite.ml.nn.UpdatesStrategy;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.Parameterized;

http://git-wip-us.apache.org/repos/asf/ignite/blob/47cfdc27/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/LocalLinearRegressionQRTrainerTest.java
----------------------------------------------------------------------
diff --git a/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/LocalLinearRegressionQRTrainerTest.java b/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/LocalLinearRegressionQRTrainerTest.java
deleted file mode 100644
index f37d71d..0000000
--- a/modules/ml/src/test/java/org/apache/ignite/ml/regressions/linear/LocalLinearRegressionQRTrainerTest.java
+++ /dev/null
@@ -1,36 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.ignite.ml.regressions.linear;
-
-import org.apache.ignite.ml.math.impls.matrix.DenseLocalOnHeapMatrix;
-import org.apache.ignite.ml.math.impls.vector.DenseLocalOnHeapVector;
-
-/**
- * Tests for {@link LinearRegressionQRTrainer} on {@link DenseLocalOnHeapMatrix}.
- */
-public class LocalLinearRegressionQRTrainerTest extends GenericLinearRegressionTrainerTest {
-    /** */
-    public LocalLinearRegressionQRTrainerTest() {
-        super(
-            new LinearRegressionQRTrainer(),
-            DenseLocalOnHeapMatrix::new,
-            DenseLocalOnHeapVector::new,
-            1e-6
-        );
-    }
-}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/ignite/blob/47cfdc27/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/DistributedWorkersChainTest.java
----------------------------------------------------------------------
diff --git a/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/DistributedWorkersChainTest.java b/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/DistributedWorkersChainTest.java
deleted file mode 100644
index 7ad59d1..0000000
--- a/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/DistributedWorkersChainTest.java
+++ /dev/null
@@ -1,189 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.ignite.ml.trainers.group;
-
-import java.util.Comparator;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.UUID;
-import java.util.stream.Stream;
-import org.apache.ignite.Ignite;
-import org.apache.ignite.IgniteCache;
-import org.apache.ignite.Ignition;
-import org.apache.ignite.ml.math.functions.IgniteBiFunction;
-import org.apache.ignite.ml.math.functions.IgniteFunction;
-import org.apache.ignite.ml.math.functions.IgniteSupplier;
-import org.apache.ignite.ml.trainers.group.chain.Chains;
-import org.apache.ignite.ml.trainers.group.chain.ComputationsChain;
-import org.apache.ignite.ml.trainers.group.chain.EntryAndContext;
-import org.apache.ignite.testframework.junits.common.GridCommonAbstractTest;
-import org.junit.Assert;
-
-/** */
-public class DistributedWorkersChainTest extends GridCommonAbstractTest {
-    /** Count of nodes. */
-    private static final int NODE_COUNT = 3;
-
-    /** Grid instance. */
-    protected Ignite ignite;
-
-    /**
-     * Default constructor.
-     */
-    public DistributedWorkersChainTest() {
-        super(false);
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    @Override protected void beforeTest() throws Exception {
-        ignite = grid(NODE_COUNT);
-        TestGroupTrainingCache.getOrCreate(ignite).removeAll();
-        TestGroupTrainingSecondCache.getOrCreate(ignite).removeAll();
-    }
-
-    /** {@inheritDoc} */
-    @Override protected void beforeTestsStarted() throws Exception {
-        for (int i = 1; i <= NODE_COUNT; i++)
-            startGrid(i);
-    }
-
-    /** {@inheritDoc} */
-    @Override protected void afterTestsStopped() throws Exception {
-        stopAllGrids();
-    }
-
-    /** */
-    public void testId() {
-        ComputationsChain<TestLocalContext, Double, Integer, Integer, Integer> chain = Chains.create();
-
-        UUID trainingUUID = UUID.randomUUID();
-        Integer res = chain.process(1, new GroupTrainingContext<>(new TestLocalContext(0, trainingUUID), TestGroupTrainingCache.getOrCreate(ignite), ignite));
-
-        Assert.assertEquals(1L, (long)res);
-    }
-
-    /** */
-    public void testSimpleLocal() {
-        ComputationsChain<TestLocalContext, Double, Integer, Integer, Integer> chain = Chains.create();
-
-        IgniteCache<GroupTrainerCacheKey<Double>, Integer> cache = TestGroupTrainingCache.getOrCreate(ignite);
-        int init = 1;
-        int initLocCtxData = 0;
-        UUID trainingUUID = UUID.randomUUID();
-        TestLocalContext locCtx = new TestLocalContext(initLocCtxData, trainingUUID);
-
-        Integer res = chain.
-            thenLocally((prev, lc) -> prev + 1).
-            process(init, new GroupTrainingContext<>(locCtx, cache, ignite));
-
-        Assert.assertEquals(init + 1, (long)res);
-        Assert.assertEquals(initLocCtxData, locCtx.data());
-    }
-
-    /** */
-    public void testChainLocal() {
-        ComputationsChain<TestLocalContext, Double, Integer, Integer, Integer> chain = Chains.create();
-
-        IgniteCache<GroupTrainerCacheKey<Double>, Integer> cache = TestGroupTrainingCache.getOrCreate(ignite);
-        int init = 1;
-        int initLocCtxData = 0;
-        UUID trainingUUID = UUID.randomUUID();
-        TestLocalContext locCtx = new TestLocalContext(initLocCtxData, trainingUUID);
-
-        Integer res = chain.
-            thenLocally((prev, lc) -> prev + 1).
-            thenLocally((prev, lc) -> prev * 5).
-            process(init, new GroupTrainingContext<>(locCtx, cache, ignite));
-
-        Assert.assertEquals((init + 1) * 5, (long)res);
-        Assert.assertEquals(initLocCtxData, locCtx.data());
-    }
-
-    /** */
-    public void testChangeLocalContext() {
-        ComputationsChain<TestLocalContext, Double, Integer, Integer, Integer> chain = Chains.create();
-        IgniteCache<GroupTrainerCacheKey<Double>, Integer> cache = TestGroupTrainingCache.getOrCreate(ignite);
-        int init = 1;
-        int newData = 10;
-        UUID trainingUUID = UUID.randomUUID();
-        TestLocalContext locCtx = new TestLocalContext(0, trainingUUID);
-
-        Integer res = chain.
-            thenLocally((prev, lc) -> { lc.setData(newData); return prev;}).
-            process(init, new GroupTrainingContext<>(locCtx, cache, ignite));
-
-        Assert.assertEquals(newData, locCtx.data());
-        Assert.assertEquals(init, res.intValue());
-    }
-
-    /** */
-    public void testDistributed() {
-        ComputationsChain<TestLocalContext, Double, Integer, Integer, Integer> chain = Chains.create();
-        IgniteCache<GroupTrainerCacheKey<Double>, Integer> cache = TestGroupTrainingCache.getOrCreate(ignite);
-        int init = 1;
-        UUID trainingUUID = UUID.randomUUID();
-        TestLocalContext locCtx = new TestLocalContext(0, trainingUUID);
-
-        Map<GroupTrainerCacheKey<Double>, Integer> m = new HashMap<>();
-        m.put(new GroupTrainerCacheKey<>(0L, 1.0, trainingUUID), 1);
-        m.put(new GroupTrainerCacheKey<>(1L, 2.0, trainingUUID), 2);
-        m.put(new GroupTrainerCacheKey<>(2L, 3.0, trainingUUID), 3);
-        m.put(new GroupTrainerCacheKey<>(3L, 4.0, trainingUUID), 4);
-
-        Stream<GroupTrainerCacheKey<Double>> keys = m.keySet().stream();
-
-        cache.putAll(m);
-
-        IgniteBiFunction<Integer, TestLocalContext, IgniteSupplier<Stream<GroupTrainerCacheKey<Double>>>> function = (o, l) -> () -> keys;
-        IgniteFunction<List<Integer>, Integer> max = ints -> ints.stream().mapToInt(x -> x).max().orElse(Integer.MIN_VALUE);
-
-        Integer res = chain.
-            thenDistributedForEntries((integer, context) -> () -> null, this::readAndIncrement, function, max).
-            process(init, new GroupTrainingContext<>(locCtx, cache, ignite));
-
-        int localMax = m.values().stream().max(Comparator.comparingInt(i -> i)).orElse(Integer.MIN_VALUE);
-
-        assertEquals((long)localMax, (long)res);
-
-        for (GroupTrainerCacheKey<Double> key : m.keySet())
-            m.compute(key, (k, v) -> v + 1);
-
-        assertMapEqualsCache(m, cache);
-    }
-
-    /** */
-    private ResultAndUpdates<Integer> readAndIncrement(EntryAndContext<Double, Integer, Void> ec) {
-        Integer val = ec.entry().getValue();
-
-        ResultAndUpdates<Integer> res = ResultAndUpdates.of(val);
-        res.updateCache(TestGroupTrainingCache.getOrCreate(Ignition.localIgnite()), ec.entry().getKey(), val + 1);
-
-        return res;
-    }
-
-    /** */
-    private <K, V> void assertMapEqualsCache(Map<K, V> m, IgniteCache<K, V> cache) {
-        assertEquals(m.size(), cache.size());
-
-        for (K k : m.keySet())
-            assertEquals(m.get(k), cache.get(k));
-    }
-}

http://git-wip-us.apache.org/repos/asf/ignite/blob/47cfdc27/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/GroupTrainerTest.java
----------------------------------------------------------------------
diff --git a/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/GroupTrainerTest.java b/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/GroupTrainerTest.java
deleted file mode 100644
index 5bb9a47..0000000
--- a/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/GroupTrainerTest.java
+++ /dev/null
@@ -1,90 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.ignite.ml.trainers.group;
-
-import java.util.HashMap;
-import java.util.Map;
-import org.apache.ignite.Ignite;
-import org.apache.ignite.testframework.junits.common.GridCommonAbstractTest;
-
-/**
- * Test of {@link GroupTrainer}.
- */
-public class GroupTrainerTest extends GridCommonAbstractTest {
-    /** Count of nodes. */
-    private static final int NODE_COUNT = 3;
-
-    /** Grid instance. */
-    private Ignite ignite;
-
-    /**
-     * Default constructor.
-     */
-    public GroupTrainerTest() {
-        super(false);
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    @Override protected void beforeTest() throws Exception {
-        ignite = grid(NODE_COUNT);
-        TestGroupTrainingCache.getOrCreate(ignite).removeAll();
-        TestGroupTrainingSecondCache.getOrCreate(ignite).removeAll();
-    }
-
-    /** {@inheritDoc} */
-    @Override protected void beforeTestsStarted() throws Exception {
-        for (int i = 1; i <= NODE_COUNT; i++)
-            startGrid(i);
-    }
-
-    /** {@inheritDoc} */
-    @Override protected void afterTestsStopped() throws Exception {
-        stopAllGrids();
-    }
-
-    /** */
-    public void testGroupTrainer() {
-        TestGroupTrainer trainer = new TestGroupTrainer(ignite);
-
-        int limit = 5;
-        int eachNumCnt = 3;
-        int iterCnt = 2;
-
-        ConstModel<Integer> mdl = trainer.train(new SimpleGroupTrainerInput(limit, eachNumCnt, iterCnt));
-        int locRes = computeLocally(limit, eachNumCnt, iterCnt);
-        assertEquals(locRes, (int)mdl.apply(10));
-    }
-
-    /** */
-    private int computeLocally(int limit, int eachNumCnt, int iterCnt) {
-        Map<GroupTrainerCacheKey<Double>, Integer> m = new HashMap<>();
-
-        for (int i = 0; i < limit; i++) {
-            for (int j = 0; j < eachNumCnt; j++)
-                m.put(new GroupTrainerCacheKey<>(i, (double)j, null), i);
-        }
-
-        for (int i = 0; i < iterCnt; i++)
-            for (GroupTrainerCacheKey<Double> key : m.keySet())
-                m.compute(key, (key1, integer) -> integer * integer);
-
-        return m.values().stream().filter(x -> x % 2 == 0).mapToInt(i -> i).sum();
-    }
-}

http://git-wip-us.apache.org/repos/asf/ignite/blob/47cfdc27/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/SimpleGroupTrainerInput.java
----------------------------------------------------------------------
diff --git a/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/SimpleGroupTrainerInput.java b/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/SimpleGroupTrainerInput.java
deleted file mode 100644
index db1adc7..0000000
--- a/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/SimpleGroupTrainerInput.java
+++ /dev/null
@@ -1,63 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.ignite.ml.trainers.group;
-
-import java.util.UUID;
-import java.util.stream.IntStream;
-import java.util.stream.Stream;
-import org.apache.ignite.ml.math.functions.IgniteSupplier;
-
-public class SimpleGroupTrainerInput implements GroupTrainerInput<Double> {
-    /** */
-    private int limit;
-
-    /** */
-    private int eachNumberCount;
-
-    /** */
-    private int iterCnt;
-
-    /** */
-    public SimpleGroupTrainerInput(int limit, int eachNumCnt, int iterCnt) {
-        this.limit = limit;
-        this.eachNumberCount = eachNumCnt;
-        this.iterCnt = iterCnt;
-    }
-
-    /** {@inheritDoc} */
-    @Override public IgniteSupplier<Stream<GroupTrainerCacheKey<Double>>> initialKeys(UUID trainingUUID) {
-        int lim = limit;
-        UUID uuid = trainingUUID;
-        return () -> IntStream.range(0, lim).mapToObj(i -> new GroupTrainerCacheKey<>(i, 0.0, uuid));
-    }
-
-    /** */
-    public int limit() {
-        return limit;
-    }
-
-    /** */
-    public int iterCnt() {
-        return iterCnt;
-    }
-
-    /** */
-    public int eachNumberCount() {
-        return eachNumberCount;
-    }
-}

http://git-wip-us.apache.org/repos/asf/ignite/blob/47cfdc27/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/TestGroupTrainer.java
----------------------------------------------------------------------
diff --git a/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/TestGroupTrainer.java b/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/TestGroupTrainer.java
deleted file mode 100644
index 0a49fe0..0000000
--- a/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/TestGroupTrainer.java
+++ /dev/null
@@ -1,144 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.ignite.ml.trainers.group;
-
-import java.util.List;
-import java.util.UUID;
-import java.util.stream.Collectors;
-import java.util.stream.Stream;
-import org.apache.ignite.Ignite;
-import org.apache.ignite.IgniteCache;
-import org.apache.ignite.Ignition;
-import org.apache.ignite.ml.math.functions.IgniteFunction;
-import org.apache.ignite.ml.math.functions.IgniteSupplier;
-import org.apache.ignite.ml.trainers.group.chain.Chains;
-import org.apache.ignite.ml.trainers.group.chain.ComputationsChain;
-import org.apache.ignite.ml.trainers.group.chain.EntryAndContext;
-
-/**
- * Test group trainer.
- */
-public class TestGroupTrainer extends GroupTrainer<TestGroupTrainerLocalContext, Double, Integer, Integer, Integer,
-    Double, ConstModel<Integer>, SimpleGroupTrainerInput, Void> {
-    /**
-     * Construct instance of this class with given parameters.
-     *
-     * @param ignite Ignite instance.
-     */
-    public TestGroupTrainer(Ignite ignite) {
-        super(TestGroupTrainingCache.getOrCreate(ignite), ignite);
-    }
-
-    /** {@inheritDoc} */
-    @Override protected TestGroupTrainerLocalContext initialLocalContext(SimpleGroupTrainerInput data,
-        UUID trainingUUID) {
-        return new TestGroupTrainerLocalContext(data.iterCnt(), data.eachNumberCount(), data.limit(), trainingUUID);
-    }
-
-    /** {@inheritDoc} */
-    @Override protected IgniteFunction<GroupTrainerCacheKey<Double>, ResultAndUpdates<Integer>> distributedInitializer(
-        SimpleGroupTrainerInput data) {
-        return key -> {
-            long i = key.nodeLocalEntityIndex();
-            UUID trainingUUID = key.trainingUUID();
-            IgniteCache<GroupTrainerCacheKey<Double>, Integer> cache
-                = TestGroupTrainingCache.getOrCreate(Ignition.localIgnite());
-
-            long sum = i * data.eachNumberCount();
-
-            ResultAndUpdates<Integer> res = ResultAndUpdates.of((int)sum);
-
-            for (int j = 0; j < data.eachNumberCount(); j++)
-                res.updateCache(cache, new GroupTrainerCacheKey<>(i, (double)j, trainingUUID), (int)i);
-
-            return res;
-        };
-    }
-
-    /** {@inheritDoc} */
-    @Override protected IgniteFunction<List<Integer>, Integer> reduceDistributedInitData() {
-        return id -> id.stream().mapToInt(x -> x).sum();
-    }
-
-    /** {@inheritDoc} */
-    @Override protected Double locallyProcessInitData(Integer data, TestGroupTrainerLocalContext locCtx) {
-        return data.doubleValue();
-    }
-
-    /** {@inheritDoc} */
-    @Override protected ComputationsChain<TestGroupTrainerLocalContext,
-        Double, Integer, Double, Double> trainingLoopStep() {
-        // TODO:IGNITE-7405 here we should explicitly create variable because we cannot infer context type, think about it.
-        ComputationsChain<TestGroupTrainerLocalContext, Double, Integer, Double, Double> chain = Chains.
-            create(new TestTrainingLoopStep());
-        return chain.
-            thenLocally((aDouble, context) -> {
-                context.incCnt();
-                return aDouble;
-            });
-    }
-
-    /** {@inheritDoc} */
-    @Override protected boolean shouldContinue(Double data, TestGroupTrainerLocalContext locCtx) {
-        return locCtx.cnt() < locCtx.maxCnt();
-    }
-
-    /** {@inheritDoc} */
-    @Override protected IgniteSupplier<Void> extractContextForFinalResultCreation(Double data,
-        TestGroupTrainerLocalContext locCtx) {
-        // No context is needed.
-        return () -> null;
-    }
-
-    /** {@inheritDoc} */
-    @Override protected IgniteSupplier<Stream<GroupTrainerCacheKey<Double>>> finalResultKeys(Double data,
-        TestGroupTrainerLocalContext locCtx) {
-        int limit = locCtx.limit();
-        int cnt = locCtx.eachNumberCnt();
-        UUID uuid = locCtx.trainingUUID();
-
-        return () -> TestGroupTrainingCache.allKeys(limit, cnt, uuid);
-    }
-
-    /** {@inheritDoc} */
-    @Override protected IgniteFunction<EntryAndContext<Double, Integer, Void>,
-        ResultAndUpdates<Integer>> finalResultsExtractor() {
-        return entryAndCtx -> {
-            Integer val = entryAndCtx.entry().getValue();
-            return ResultAndUpdates.of(val % 2 == 0 ? val : 0);
-        };
-    }
-
-    /** {@inheritDoc} */
-    @Override protected IgniteFunction<List<Integer>, Integer> finalResultsReducer() {
-        return id -> id.stream().mapToInt(x -> x).sum();
-    }
-
-    /** {@inheritDoc} */
-    @Override protected ConstModel<Integer> mapFinalResult(Integer res, TestGroupTrainerLocalContext locCtx) {
-        return new ConstModel<>(res);
-    }
-
-    /** {@inheritDoc} */
-    @Override protected void cleanup(TestGroupTrainerLocalContext locCtx) {
-        Stream<GroupTrainerCacheKey<Double>> toRemote = TestGroupTrainingCache.allKeys(locCtx.limit(),
-            locCtx.eachNumberCnt(), locCtx.trainingUUID());
-
-        TestGroupTrainingCache.getOrCreate(ignite).removeAll(toRemote.collect(Collectors.toSet()));
-    }
-}

http://git-wip-us.apache.org/repos/asf/ignite/blob/47cfdc27/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/TestGroupTrainerLocalContext.java
----------------------------------------------------------------------
diff --git a/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/TestGroupTrainerLocalContext.java b/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/TestGroupTrainerLocalContext.java
deleted file mode 100644
index e1a533b..0000000
--- a/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/TestGroupTrainerLocalContext.java
+++ /dev/null
@@ -1,85 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.ignite.ml.trainers.group;
-
-import java.util.UUID;
-import org.apache.ignite.ml.trainers.group.chain.HasTrainingUUID;
-
-/** */
-public class TestGroupTrainerLocalContext implements HasTrainingUUID {
-    /** */
-    private int cnt = 0;
-
-    /** */
-    private int maxCnt;
-
-    /** */
-    private int eachNumberCnt;
-
-    /** */
-    private int limit;
-
-    /** */
-    private UUID trainingUUID;
-
-    /** */
-    public TestGroupTrainerLocalContext(int maxCnt, int eachNumberCnt, int limit, UUID trainingUUID) {
-        this.maxCnt = maxCnt;
-        this.eachNumberCnt = eachNumberCnt;
-        this.limit = limit;
-        this.trainingUUID = trainingUUID;
-        this.cnt = 0;
-    }
-
-    /** */
-    public int cnt() {
-        return cnt;
-    }
-
-    /** */
-    public void setCnt(int cnt) {
-        this.cnt = cnt;
-    }
-
-    /** */
-    public TestGroupTrainerLocalContext incCnt() {
-        this.cnt++;
-
-        return this;
-    }
-
-    /** */
-    public int maxCnt() {
-        return maxCnt;
-    }
-
-    /** */
-    public int eachNumberCnt() {
-        return eachNumberCnt;
-    }
-
-    /** */
-    public int limit() {
-        return limit;
-    }
-
-    /** {@inheritDoc} */
-    @Override public UUID trainingUUID() {
-        return trainingUUID;
-    }
-}

http://git-wip-us.apache.org/repos/asf/ignite/blob/47cfdc27/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/TestGroupTrainingCache.java
----------------------------------------------------------------------
diff --git a/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/TestGroupTrainingCache.java b/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/TestGroupTrainingCache.java
deleted file mode 100644
index afee674..0000000
--- a/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/TestGroupTrainingCache.java
+++ /dev/null
@@ -1,70 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.ignite.ml.trainers.group;
-
-import java.util.Arrays;
-import java.util.UUID;
-import java.util.stream.Stream;
-import org.apache.ignite.Ignite;
-import org.apache.ignite.IgniteCache;
-import org.apache.ignite.cache.CacheAtomicityMode;
-import org.apache.ignite.cache.CacheMode;
-import org.apache.ignite.cache.CacheWriteSynchronizationMode;
-import org.apache.ignite.configuration.CacheConfiguration;
-
-/** */
-public class TestGroupTrainingCache {
-    /** */
-    public static String CACHE_NAME = "TEST_GROUP_TRAINING_CACHE";
-
-    /** */
-    public static IgniteCache<GroupTrainerCacheKey<Double>, Integer> getOrCreate(Ignite ignite) {
-        CacheConfiguration<GroupTrainerCacheKey<Double>, Integer> cfg = new CacheConfiguration<>();
-
-        // Write to primary.
-        cfg.setWriteSynchronizationMode(CacheWriteSynchronizationMode.PRIMARY_SYNC);
-
-        // Atomic transactions only.
-        cfg.setAtomicityMode(CacheAtomicityMode.ATOMIC);
-
-        // No copying of values.
-        cfg.setCopyOnRead(false);
-
-        // Cache is partitioned.
-        cfg.setCacheMode(CacheMode.PARTITIONED);
-
-        cfg.setBackups(0);
-
-        cfg.setOnheapCacheEnabled(true);
-
-        cfg.setName(CACHE_NAME);
-
-        return ignite.getOrCreateCache(cfg);
-    }
-
-    /** */
-    public static Stream<GroupTrainerCacheKey<Double>> allKeys(int limit, int eachNumberCnt, UUID trainingUUID) {
-        GroupTrainerCacheKey<Double>[] a =new GroupTrainerCacheKey[limit * eachNumberCnt];
-
-        for (int num = 0; num < limit; num++)
-            for (int i = 0; i < eachNumberCnt; i++)
-                a[num * eachNumberCnt + i] = new GroupTrainerCacheKey<>(num, (double)i, trainingUUID);
-
-        return Arrays.stream(a);
-    }
-}

http://git-wip-us.apache.org/repos/asf/ignite/blob/47cfdc27/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/TestGroupTrainingSecondCache.java
----------------------------------------------------------------------
diff --git a/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/TestGroupTrainingSecondCache.java b/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/TestGroupTrainingSecondCache.java
deleted file mode 100644
index e16ed7c..0000000
--- a/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/TestGroupTrainingSecondCache.java
+++ /dev/null
@@ -1,56 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.ignite.ml.trainers.group;
-
-import org.apache.ignite.Ignite;
-import org.apache.ignite.IgniteCache;
-import org.apache.ignite.cache.CacheAtomicityMode;
-import org.apache.ignite.cache.CacheMode;
-import org.apache.ignite.cache.CacheWriteSynchronizationMode;
-import org.apache.ignite.configuration.CacheConfiguration;
-
-/** */
-public class TestGroupTrainingSecondCache {
-    /** */
-    public static String CACHE_NAME = "TEST_GROUP_TRAINING_SECOND_CACHE";
-
-    /** */
-    public static IgniteCache<GroupTrainerCacheKey<Character>, Integer> getOrCreate(Ignite ignite) {
-        CacheConfiguration<GroupTrainerCacheKey<Character>, Integer> cfg = new CacheConfiguration<>();
-
-        // Write to primary.
-        cfg.setWriteSynchronizationMode(CacheWriteSynchronizationMode.PRIMARY_SYNC);
-
-        // Atomic transactions only.
-        cfg.setAtomicityMode(CacheAtomicityMode.ATOMIC);
-
-        // No copying of values.
-        cfg.setCopyOnRead(false);
-
-        // Cache is partitioned.
-        cfg.setCacheMode(CacheMode.PARTITIONED);
-
-        cfg.setBackups(0);
-
-        cfg.setOnheapCacheEnabled(true);
-
-        cfg.setName(CACHE_NAME);
-
-        return ignite.getOrCreateCache(cfg);
-    }
-}

http://git-wip-us.apache.org/repos/asf/ignite/blob/47cfdc27/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/TestLocalContext.java
----------------------------------------------------------------------
diff --git a/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/TestLocalContext.java b/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/TestLocalContext.java
deleted file mode 100644
index 3f0237f..0000000
--- a/modules/ml/src/test/java/org/apache/ignite/ml/trainers/group/TestLocalContext.java
+++ /dev/null
@@ -1,51 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.ignite.ml.trainers.group;
-
-import java.util.UUID;
-import org.apache.ignite.ml.trainers.group.chain.HasTrainingUUID;
-
-/** */
-public class TestLocalContext implements HasTrainingUUID {
-    /** */
-    private final UUID trainingUUID;
-
-    /** */
-    private int data;
-
-    /** */
-    public TestLocalContext(int data, UUID trainingUUID) {
-        this.data = data;
-        this.trainingUUID = trainingUUID;
-    }
-
-    /** */
-    public int data() {
-        return data;
-    }
-
-    /** */
-    public void setData(int data) {
-        this.data = data;
-    }
-
-    /** {@inheritDoc} */
-    @Override public UUID trainingUUID() {
-        return trainingUUID;
-    }
-}


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