!9355 [MSLITE] fix a bug in normalize operator

From: @probiotics_53
Reviewed-by: @zhanghaibo5,@zhanghaibo5,@hangangqiang
Signed-off-by: @zhanghaibo5

mindspore/lite/src/runtime/kernel/arm/string/normalize.cc

@@ -49,12 +49,13 @@ int NormalizeCPUKernel::Init() {
 
 int NormalizeCPUKernel::ReSize() { return RET_OK; }
 
-std::string NormalizeCPUKernel::Trim(const std::string &str, const std::string &whitespace /*= " \t\n\v\f\r"*/) {
-  if (str.empty()) {
+std::string NormalizeCPUKernel::Trim(const std::string &str, const std::string &pattern /*= " \t\n\v\f\r"*/) {
+  auto begin = str.find_first_not_of(pattern);
+  if (begin == std::string::npos) {
+    MS_LOG(WARNING) << "Meaningless input string!";
     return "";
   }
-  auto begin = str.find_first_not_of(whitespace);
-  auto end = str.find_last_not_of(whitespace);
+  auto end = str.find_last_not_of(pattern);
   const auto range = end - begin + 1;
   return str.substr(begin, range);
 }

mindspore/lite/src/runtime/kernel/arm/string/normalize.h

@@ -36,7 +36,7 @@ class NormalizeCPUKernel : public LiteKernel {
   int Run() override;
 
  private:
-  std::string Trim(const std::string &str, const std::string &whitespace = " \t\n\v\f\r");
+  std::string Trim(const std::string &str, const std::string &pattern = " \t\n\v\f\r");
   std::string GlobalReplace(const std::string &str, const std::string &reg, const std::string &replace);
   std::string Normalize(const std::string &str);
   std::vector<char *> normalized_strs;

mindspore/lite/test/models_mindspore.cfg

@@ -15,3 +15,4 @@ mindspore_ghost-nose-pets-811.mindir 0.5
 mindspore_ghost-pets-8244.mindir 1.5
 mindspore_ghostnet600M-pets.mindir 1.5
 mindspore_ghostnet_1x_pets_int8.mindir 12
+mindspore_deeplab_v3_s16.mindir 6.5

mindspore/lite/test/models_onnx_fp16.cfg

@@ -33,3 +33,4 @@ rain-princess-9.onnx 5
 udnie-9.onnx 3
 adversarial_pruning.onnx 3
 residual_distill_res34_cifar10_bs_1_update.onnx 2
+residual_distill_res50_cifar10_bs_1_update.onnx 2