fix clear zero method and remove useless code

paddle/operators/pool_cudnn_op.cu

@@ -117,8 +117,6 @@ class PoolCudnnGradOpKernel : public framework::OpKernel<T> {
     // ------------------- cudnn descriptors ---------------------
     ScopedTensorDescriptor input_desc;
     ScopedTensorDescriptor output_desc;
-    ScopedTensorDescriptor input_grad_desc;
-    ScopedTensorDescriptor output_grad_desc;
     ScopedPoolingDescriptor pool_desc;
     DataLayout layout = DataLayout::kNCHW;
 
@@ -126,9 +124,6 @@ class PoolCudnnGradOpKernel : public framework::OpKernel<T> {
         input_desc.descriptor<T>(layout, Dims2VectorPool(input->dims()));
     cudnnTensorDescriptor_t cudnn_output_desc =
         output_desc.descriptor<T>(layout, Dims2VectorPool(output->dims()));
-    cudnnTensorDescriptor_t cudnn_output_grad_desc =
-        output_grad_desc.descriptor<T>(layout,
-                                       Dims2VectorPool(output_grad->dims()));
 
     PoolingMode pooling_mode;
     if (pooling_type == "max") {
@@ -146,18 +141,13 @@ class PoolCudnnGradOpKernel : public framework::OpKernel<T> {
 
     if (input_grad) {
       T *input_grad_data = input_grad->mutable_data<T>(ctx.GetPlace());
-      auto temp = framework::EigenVector<T>::Flatten(*input_grad);
-      temp.device(ctx.GetEigenDevice<paddle::platform::GPUPlace>()) =
-          temp.constant(static_cast<T>(0));
-
-      cudnnTensorDescriptor_t cudnn_input_grad_desc =
-          input_grad_desc.descriptor<T>(layout,
-                                        Dims2VectorPool(input_grad->dims()));
+      math::SetConstant<paddle::platform::GPUPlace, T> set_zero;
+      set_zero(ctx.device_context(), input_grad, static_cast<T>(0));
 
       PADDLE_ENFORCE(platform::dynload::cudnnPoolingBackward(
           handle, cudnn_pool_desc, &alpha, cudnn_output_desc, output_data,
-          cudnn_output_grad_desc, output_grad_data, cudnn_input_desc,
-          input_data, &beta, cudnn_input_grad_desc, input_grad_data));
+          cudnn_output_desc, output_grad_data, cudnn_input_desc, input_data,
+          &beta, cudnn_input_desc, input_grad_data));
     }
   }
 };

python/paddle/v2/framework/tests/test_pool_max_op.py

@@ -86,7 +86,7 @@ class TestMaxPoolWithIndex_Op(OpTest):
             'strides': self.strides,
             'paddings': self.paddings,
             'ksize': self.ksize,
-            'global_pooling': self.global_pool,
+            'globalPooling': self.global_pool,
         }
 
         self.inputs = {'X': input}