horn-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From eoriented <...@git.apache.org>
Subject [GitHub] incubator-horn pull request: HORN-9: Add activations package and R...
Date Tue, 17 Nov 2015 07:04:17 GMT
Github user eoriented commented on a diff in the pull request:

    https://github.com/apache/incubator-horn/pull/4#discussion_r45027621
  
    --- Diff: src/main/java/org/apache/horn/activations/Tanh.java ---
    @@ -0,0 +1,38 @@
    +/**
    + * 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.horn.activations;
    +
    +import org.apache.hama.commons.math.DoubleFunction;
    +
    +/**
    + * Tanh function.
    + * 
    + */
    +public class Tanh extends DoubleFunction {
    +
    +  @Override
    +  public double apply(double value) {
    +    return Math.tanh(value);
    +  }
    +
    +  @Override
    +  public double applyDerivative(double value) {
    +    return 1 - Math.pow((Math.exp(2 * value) - 1) / (Math.exp(2 * value) + 1), 2);
    --- End diff --
    
    I think derivative of Tanh is more simple than this code.
    ```java
    return 1 - Math.pow(Math.tanh(value), 2);
    ```
    Would you mind modifying the code like above code?



---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---

Mime
View raw message