!12508 [MS][LITE][CPU]fix bug of pad_fp16 op

From: @fuzhiye
Reviewed-by: @zhang_xue_tong,@zhanghaibo5
Signed-off-by: @zhang_xue_tong

mindspore/lite/src/runtime/kernel/arm/fp16/pad_fp16.cc

@@ -26,6 +26,9 @@ using mindspore::lite::RET_OK;
 using mindspore::schema::PrimitiveType_Pad;
 
 namespace mindspore::kernel {
+namespace {
+constexpr size_t kPadMaxInputSize = 2;
+}  // namespace
 int PadFp16CPUKernel::RunImpl(int task_id) {
   PadFp16(input_, output_, in_, out_, pad_param_->paddings_, task_id, context_->thread_num_);
   return RET_OK;
@@ -48,6 +51,9 @@ int PadFp16CPUKernel::Run() {
 
   int ret = 0;
   if (pad_param_->pad_mode_ == static_cast<int>(schema::PaddingMode_CONSTANT)) {
+    if (in_tensors_.size() == kPadMaxInputSize) {
+      CopyPaddingFromInput();
+    }
     if (pad_param_->constant_value_ - 0.0f < 1e-5) {
       memset(output_, 0, output_tensor->ElementsNum() * sizeof(float16_t));
     } else {

mindspore/lite/src/runtime/kernel/arm/fp32/pad_fp32.h

@@ -47,7 +47,6 @@ class PadCPUKernel : public LiteKernel {
 
  private:
   int CheckPaddings(int *paddings, int length, int *input_shape, int mode);
-  int CopyPaddingFromInput();
   void CalculateStrides();
   int ExtendShape(int *shape, int length, const int *ori_shape, int rank);
   int ExtendPaddings(int *paddings, int length, const int *ori_paddings, int ori_length);
@@ -55,6 +54,7 @@ class PadCPUKernel : public LiteKernel {
 
  protected:
   int HandleMirrorPad();
+  int CopyPaddingFromInput();
   PadParameter *pad_param_ = nullptr;
   int in_[4] = {0};
   int out_[4] = {0};