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From GitBox <...@apache.org>
Subject [GitHub] [incubator-tvm] junrushao1994 commented on a change in pull request #5601: [DataType] Add bfloat16
Date Sat, 13 Jun 2020 07:07:01 GMT

junrushao1994 commented on a change in pull request #5601:
URL: https://github.com/apache/incubator-tvm/pull/5601#discussion_r439716507



##########
File path: tests/python/unittest/test_tir_transform_bf16_legalize.py
##########
@@ -0,0 +1,152 @@
+# 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.
+import tvm
+import topi
+from tvm import te
+from tvm.tir import const
+
+
+def lower_stmt(sche, params, passfunc):
+    func = tvm.driver.build_module.form_irmodule(sche, params, "main", None)["main"]
+    func = passfunc()(
+        tvm.IRModule.from_expr(func))["main"]
+    stmt = func.body
+    return stmt
+
+
+def test_promote():
+    def runpass(op, passfunc):
+        a = te.placeholder((100,), dtype='bfloat16')
+        b = te.placeholder((100,), dtype='bfloat16')
+        c = te.compute((100,), lambda i: op(a[i], b[i]))
+        s = te.create_schedule(c.op)
+        return lower_stmt(s, [a, b, c], passfunc)
+    
+    def get_promoted(op):
+        a = te.placeholder((100,), dtype='bfloat16')
+        b = te.placeholder((100,), dtype='bfloat16')
+        c = te.compute((100,), lambda i:
+                topi.cast(op(topi.cast(a[i],'float'),
+                    topi.cast(b[i],'float')), 'bfloat16')
+                )
+        s = te.create_schedule(c.op)
+        func = tvm.driver.build_module.form_irmodule(s, [a,b,c], "main", None)["main"]
+        return func.body
+
+    def test_promoted(op):
+        stmt = runpass(op, tvm.tir.transform.BF16Promote)
+        tvm.ir.assert_structural_equal(stmt, get_promoted(op))
+    test_promoted(topi.add)
+    test_promoted(topi.subtract)
+    test_promoted(topi.multiply)
+    test_promoted(topi.divide)
+
+def test_eliminate():
+    def to32(v):
+        return topi.cast(v, 'float')
+    def to16(v):
+        return topi.cast(v, 'bfloat16')
+    def get_eliminated():
+        a = te.placeholder((100,), dtype='bfloat16')
+        b = te.placeholder((100,), dtype='bfloat16')
+        c = te.compute((100,), lambda i: to16(
+            topi.add(
+                to32(
+                    to16(
+                        topi.add(
+                            to32(a[i]),
+                            to32(b[i]),
+                        )
+                    )
+                ),
+                to32(
+                    to16(
+                        topi.add(
+                            to32(a[i]),
+                            to32(b[i]),
+                        )
+                    )
+                )
+            )
+        ))
+        s = te.create_schedule(c.op)
+        stmt = lower_stmt(s, [a, b, c], tvm.tir.transform.BF16CastElimination)
+        return stmt
+
+    def get_target():
+        a = te.placeholder((100,), dtype='bfloat16')
+        b = te.placeholder((100,), dtype='bfloat16')
+        c = te.compute((100,), lambda i: to16(
+            topi.add(topi.add(
+                        to32(a[i]),
+                        to32(b[i]),
+                    ),
+                    topi.add(
+                        to32(a[i]),
+                        to32(b[i]),
+                    )
+                )
+        ))
+        s = te.create_schedule(c.op)
+        func = tvm.driver.build_module.form_irmodule(s, [a,b,c], "main", None)["main"]
+        return func.body
+    tvm.ir.assert_structural_equal(get_eliminated(), get_target())
+
+def test_legalize():
+    def to32(v):
+        uint32_v = topi.cast(v, "uint32")
+        uint32_v = tvm.tir.call_pure_intrin("uint32", "shift_left", uint32_v, tvm.tir.const(16,
"uint32"))
+        return tvm.tir.call_pure_intrin("float32", "reinterpret", uint32_v)
+    def to16(v):
+        uint32_v = tvm.tir.call_pure_intrin("uint32", "reinterpret", v)
+        rounding_bias = tvm.tir.call_pure_intrin("uint32", "shift_right", uint32_v, tvm.tir.const(16,
"uint32"))
+        rounding_bias = tvm.tir.call_pure_intrin("uint32", "bitwise_and", rounding_bias,
tvm.tir.const(1, "uint32"))
+        rounding_bias = rounding_bias + tvm.tir.const(0x7FFF, "uint16")
+        uint32_v = uint32_v + rounding_bias
+        uint32_v = tvm.tir.call_pure_intrin("uint32", "shift_right", uint32_v, tvm.tir.const(16,
"uint32"))
+        return topi.cast(uint32_v, 'uint16')
+
+    def check(fcompute_before, fcompute_after):
+        a = te.placeholder((100,), dtype='bfloat16', name = 'A')
+        b = te.placeholder((100,), dtype='bfloat16', name = 'B')
+        c = te.compute((100,), fcompute_before(a,b), name = 'C')
+        s = te.create_schedule(c.op)
+        stmt = lower_stmt(s, [a, b, c], tvm.tir.transform.BF16Legalize)
+
+        a = te.placeholder((100,), dtype='uint16', name = 'A')
+        b = te.placeholder((100,), dtype='uint16', name = 'B')
+        c = te.compute((100,), fcompute_after(a,b), name = 'C')
+        s = te.create_schedule(c.op)
+        func = tvm.driver.build_module.form_irmodule(s, [a,b,c], "main", None)["main"]
+        tvm.ir.assert_structural_equal(stmt, func.body)
+
+    def orig1(a,b):
+        return lambda i: a[i]+b[i]+a[99-i]+b[99-i]
+    def after1(a,b):
+        return lambda i: to16(to32(a[i])+to32(b[i])+to32(a[99-i])+to32(b[99-i]))
+    def orig2(a,b):
+        return lambda i: a[i]*b[i]+a[99-i]*b[99-i]+a[i]
+    def after2(a,b):
+        return lambda i: to16(to32(a[i])*to32(b[i])+to32(a[99-i])*to32(b[99-i])+to32(a[i]))

Review comment:
       Ooops I see. That makes sense then :-)




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