Fix for wrong conditions between forward and backward in elementwise_add_grad op (#38176)

paddle/fluid/operators/elementwise/elementwise_op.h

@@ -319,16 +319,7 @@ class ElementwiseOpGrad : public framework::OperatorWithKernel {
         ctx, framework::GradVarName("Out"));
 
 #ifdef PADDLE_WITH_MKLDNN
-    // If broadcasting is needed, use native implementation
-    auto CanMKLDNNElementwiseGradBeUsed = [&]() {
-      auto dx_dims = ctx.Input<Tensor>("X")->dims();
-      auto dy_dims = ctx.Input<Tensor>("Y")->dims();
-      // No broadcast or broadcasting of data on inner dims is supported
-      return (dx_dims[dx_dims.size() - 1] == dy_dims[dy_dims.size() - 1]);
-    };
-
-    if (this->CanMKLDNNBeUsed(ctx, input_data_type) &&
-        CanMKLDNNElementwiseGradBeUsed()) {
+    if (this->CanMKLDNNBeUsed(ctx, input_data_type)) {
       return framework::OpKernelType(input_data_type, ctx.GetPlace(),
                                      framework::DataLayout::kMKLDNN,
                                      framework::LibraryType::kMKLDNN);