From 3e9ad093c67492288c03ee61cfe6edf93438488a Mon Sep 17 00:00:00 2001
From: FlyingQianMM <245467267@qq.com>
Date: Mon, 4 Apr 2022 21:54:33 +0800
Subject: [PATCH] fix index_select kernel configuration error where input numel
 is 0 (#41383)

---
 paddle/phi/kernels/gpu/index_select_grad_kernel.cu | 3 +++
 paddle/phi/kernels/gpu/index_select_kernel.cu      | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/paddle/phi/kernels/gpu/index_select_grad_kernel.cu b/paddle/phi/kernels/gpu/index_select_grad_kernel.cu
index 209ce1ccf5..75ae1bbcd0 100644
--- a/paddle/phi/kernels/gpu/index_select_grad_kernel.cu
+++ b/paddle/phi/kernels/gpu/index_select_grad_kernel.cu
@@ -85,6 +85,9 @@ void IndexSelectGradKernel(const Context& ctx,
                         phi::DataType::INT64));
 
   int64_t numel = x_grad->numel();
+  if (numel == 0) {
+    return;
+  }
   int64_t index_nums = index.numel();
   int64_t out_nums = out_grad.numel();
 
diff --git a/paddle/phi/kernels/gpu/index_select_kernel.cu b/paddle/phi/kernels/gpu/index_select_kernel.cu
index 57a13a9aef..38a6582d79 100644
--- a/paddle/phi/kernels/gpu/index_select_kernel.cu
+++ b/paddle/phi/kernels/gpu/index_select_kernel.cu
@@ -72,6 +72,9 @@ void IndexSelectKernel(const Context& ctx,
   T* out_data = ctx.template Alloc<T>(output);
 
   int64_t numel = output->numel();
+  if (numel == 0) {
+    return;
+  }
   auto stream = ctx.stream();
 
   unsigned int block_dim = PADDLE_CUDA_NUM_THREADS;
-- 
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