[incubator-mxnet] branch master updated: Fix req=null in SliceLikeBackward (#14209)

[haibin]

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The following commit(s) were added to refs/heads/master by this push:
     new f9c436b  Fix req=null in SliceLikeBackward (#14209)
f9c436b is described below

commit f9c436be2689ac809aab5422b41f2fd768e8c4bc
Author: Przemyslaw Tredak <ptre...@gmail.com>
AuthorDate: Tue Feb 19 16:03:36 2019 -0800

    Fix req=null in SliceLikeBackward (#14209)
---
 src/operator/tensor/matrix_op-inl.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/operator/tensor/matrix_op-inl.h 
b/src/operator/tensor/matrix_op-inl.h
index 97c4fa5..28ed421 100644
--- a/src/operator/tensor/matrix_op-inl.h
+++ b/src/operator/tensor/matrix_op-inl.h
@@ -1389,13 +1389,15 @@ void SliceLikeBackward(const nnvm::NodeAttrs& attrs,
   CHECK_EQ(inputs.size(), 1U);
   CHECK_EQ(outputs.size(), 2U);
   CHECK_EQ(req.size(), 2U);
-  if (req[0] == kNullOp) return;
   using namespace mshadow;
   Stream<xpu>* s = ctx.get_stream<xpu>();
+  if (req[1] != kNullOp && req[1] != kAddTo) {
+    Fill(s, outputs[1], req[1], 0);  // Second input not relavant to gradients.
+  }
+  if (req[0] == kNullOp) return;
   const TBlob& ograd = inputs[0];
   const TBlob& igrad = outputs[0];
   const SliceLikeParam& param = nnvm::get<SliceLikeParam>(attrs.parsed);
-  Fill(s, outputs[1], req[1], 0);  // Second input not relavant to gradients.
   if (req[0] == kWriteTo) {
     Fill(s, igrad, req[0], 0);
   } else if (req[0] == kWriteInplace) {