From e69d9c845b30d7150f122c41805b1bc5bf75136c Mon Sep 17 00:00:00 2001
From: Bai Yifan <bai.yf@qq.com>
Date: Thu, 13 Sep 2018 09:49:22 +0800
Subject: [PATCH] code fix (#13365)

---
 paddle/fluid/operators/softmax_with_cross_entropy_op.cu | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/paddle/fluid/operators/softmax_with_cross_entropy_op.cu b/paddle/fluid/operators/softmax_with_cross_entropy_op.cu
index 148faec4a..a07c17348 100644
--- a/paddle/fluid/operators/softmax_with_cross_entropy_op.cu
+++ b/paddle/fluid/operators/softmax_with_cross_entropy_op.cu
@@ -31,7 +31,8 @@ __global__ void CrossEntropyGrad(T* logit_grad, const int64_t* labels,
   for (int i = blockIdx.x * blockDim.x + threadIdx.x; i < batch_size;
        i += blockDim.x * gridDim.x) {
     int idx = i * class_num + labels[i];
-    logit_grad[idx] -= static_cast<T>(1.);
+    logit_grad[idx] -=
+        ignore_index == labels[i] ? static_cast<T>(0.) : static_cast<T>(1.);
   }
 }
 
-- 
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