Add nullptr check

paddle/operators/clip_op.cc

@@ -68,9 +68,10 @@ class ClipOpGrad : public framework::OperatorWithKernel {
                             "Input(Out@GRAD) should not be null");
     auto x_dims = ctx.Input<LoDTensor>("X")->dims();
     auto *x_grad = ctx.Output<LoDTensor>(framework::GradVarName("X"));
-
+    if (x_grad != nullptr) {
       x_grad->Resize(x_dims);
     }
+  }
 };
 
 }  // namespace operators

paddle/operators/clip_op.cu

@@ -43,6 +43,7 @@ class ClipGradientOpCUDAKernel : public framework::OpKernel {
     auto min = context.Attr<float>("min");
     auto* d_out = context.Input<LoDTensor>(framework::GradVarName("Out"));
     auto* d_x = context.Output<LoDTensor>(framework::GradVarName("X"));
+    if (d_x != nullptr) {
       auto* x = context.Input<LoDTensor>("X");
       auto dims = d_x->dims();
       int64_t count = d_out->numel();
@@ -60,6 +61,7 @@ class ClipGradientOpCUDAKernel : public framework::OpKernel {
                               .stream()>>>(count, min, max, x_data, d_out_data,
                                            d_x_data);
     }
+  }
 };
 
 }  // namespace operators

paddle/operators/clip_op.h

@@ -78,6 +78,7 @@ class ClipGradKernel : public framework::OpKernel {
     auto min = context.op().Attr<float>("min");
     auto* d_out = context.Input<LoDTensor>(framework::GradVarName("Out"));
     auto* d_x = context.Output<LoDTensor>(framework::GradVarName("X"));
+    if (d_x != nullptr) {
       auto* x = context.Input<LoDTensor>("X");
       auto dims = d_x->dims();
       int64_t count = d_out->numel();
@@ -92,6 +93,7 @@ class ClipGradKernel : public framework::OpKernel {
         }
       }
     }
+  }
 };
 
 }  // namespace operators