[GitHub] anirudhacharya commented on a change in pull request #12306: SoftMin Operator

[GitBox <gi...@apache.org>]

anirudhacharya commented on a change in pull request #12306: SoftMin Operator
URL: https://github.com/apache/incubator-mxnet/pull/12306#discussion_r212373939
 
 

 ##########
 File path: src/operator/nn/softmax.cc
 ##########
 @@ -116,6 +116,45 @@ MXNET_OPERATOR_REGISTER_BINARY(_backward_softmax)
 .set_attr<FCompute>("FCompute<cpu>", SoftmaxGradCompute<cpu, op::mshadow_op::mul,
                                                         mxnet_op::softmax_bwd>);
 
+MXNET_OPERATOR_REGISTER_UNARY(softmin)
+.describe(R"code(Applies the softmin function.
+
+The resulting array contains elements in the range (0,1) and the elements along the given axis sum
+up to 1. Equivalant to `softmax(-z)` where `softmax(z)` is defined as:
+
+.. math::
+   softmax(\mathbf{z/t})_j = \frac{e^{z_j/t}}{\sum_{k=1}^K e^{z_k/t}}
+
+for :math:`j = 1, ..., K`
+
+t is the temperature parameter in softmax function. By default, t equals 1.0
+
+Example::
+
+  x = [[ 1.  2.  3.]
+       [ 3.  2.  1.]]
+
+  softmax(x,axis=0) = [[ 0.88079703,  0.5,  0.11920292],
 
 Review comment:
   Typo: this should be softmin

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