!21550 [MSLITE] Fix bug of pad operator.

Merge pull request !21550 from wangshaocong/bugfix_master

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

@@ -27,7 +27,6 @@ using mindspore::schema::PrimitiveType_PadFusion;
 namespace mindspore::kernel {
 namespace {
 constexpr size_t kPadCommonInputSize = 2;
-constexpr size_t kPadMaxInputSize = 3;
 }  // namespace
 int PadFp16CPUKernel::RunImpl(int task_id) {
   PadFp16(input_, output_, in_, out_, pad_param_->paddings_, task_id, op_parameter_->thread_num_);
@@ -102,9 +101,6 @@ int PadFp16CPUKernel::Run() {
         return RET_ERROR;
       }
     }
-    if (in_tensors_.size() == kPadMaxInputSize) {
-      pad_param_->constant_value_ = reinterpret_cast<float *>(in_tensors_.at(2)->data_c())[0];
-    }
     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.cc

@@ -29,7 +29,6 @@ namespace mindspore::kernel {
 namespace {
 constexpr size_t kMirrorPadInputSize = 2;
 constexpr size_t kPadCommonInputSize = 2;
-constexpr size_t kPadMaxInputSize = 3;
 }  // namespace
 int PadCPUKernel::Init() {
   CHECK_LESS_RETURN(in_tensors_.size(), 1);
@@ -397,9 +396,6 @@ int PadCPUKernel::Run() {
         return RET_ERROR;
       }
     }
-    if (in_tensors_.size() == kPadMaxInputSize) {
-      pad_param_->constant_value_ = reinterpret_cast<float *>(in_tensors_.at(2)->data_c())[0];
-    }
     auto output = out_tensors_.at(0);
     int output_size = output->ElementsNum();
     auto output_data = reinterpret_cast<float *>(output->data_c());