[bug fix] fix unfold runtime bug (#38834)

paddle/fluid/operators/unfold_op.cc

@@ -143,6 +143,9 @@ class UnfoldOp : public framework::OperatorWithKernel {
             "but recieved dilations_height: %d dilations_width: %d.",
             dilations[0], dilations[1]));
 
+    bool contain_unknown_dim = framework::contain_unknown_dim(in_dims);
+    bool check = ctx->IsRuntime() || !contain_unknown_dim;
+    if (check) {
       std::vector<int> out_dims;
       out_dims.push_back(in_dims[0]);
 
@@ -152,24 +155,27 @@ class UnfoldOp : public framework::OperatorWithKernel {
       int output_height =
           CalcOutputSize(in_dims[2], kernel_sizes[0], dilations[0], paddings[0],
                          paddings[2], strides[0]);
-    int output_width = CalcOutputSize(in_dims[3], kernel_sizes[1], dilations[1],
-                                      paddings[1], paddings[3], strides[1]);
+      int output_width =
+          CalcOutputSize(in_dims[3], kernel_sizes[1], dilations[1], paddings[1],
+                         paddings[3], strides[1]);
       // check output height and width
       PADDLE_ENFORCE_GT(
           output_height, 0,
           platform::errors::InvalidArgument(
-            "The sliding blocks calculated from input spatial size (%d, %d), "
-            "kernel_sizes (%d, %d), strides (%d, %d), dilations (%d, %d), "
-            "is (%d, %d), which should be a positive integer.",
+              "The sliding blocks calculated from input spatial size "
+              "(%d, %d), kernel_sizes (%d, %d), strides (%d, %d), "
+              "dilations (%d, %d), is (%d, %d), which should be a "
+              "positive integer.",
               in_dims[2], in_dims[3], kernel_sizes[0], kernel_sizes[1],
               strides[0], strides[1], dilations[0], dilations[1], output_height,
               output_width));
       PADDLE_ENFORCE_GT(
           output_width, 0,
           platform::errors::InvalidArgument(
-            "The sliding blocks calculated from input spatial size (%d, %d), "
-            "kernel_sizes (%d, %d), strides (%d, %d), dilations (%d, %d), "
-            "is (%d, %d), which should be a positive integer.",
+              "The sliding blocks calculated from input spatial size "
+              "(%d, %d), kernel_sizes (%d, %d), strides (%d, %d), "
+              "dilations (%d, %d), is (%d, %d), which should be a "
+              "positive integer.",
               in_dims[2], in_dims[3], kernel_sizes[0], kernel_sizes[1],
               strides[0], strides[1], dilations[0], dilations[1], output_height,
               output_width));
@@ -178,6 +184,7 @@ class UnfoldOp : public framework::OperatorWithKernel {
 
       ctx->SetOutputDim("Y", framework::make_ddim(out_dims));
     }
+  }
 
  protected:
   framework::OpKernelType GetExpectedKernelType(