fix reshape and l2norm tflite parser bug

mindspore/lite/tools/converter/parser/tflite/tflite_activation_parser.cc

@@ -51,7 +51,6 @@ STATUS TfliteActivationParser::Parse(const std::unique_ptr<tflite::OperatorT> &t
   if (std::strcmp(node_name,  "Relu") == 0) {
     MS_LOG(DEBUG) << "parse TfliteReluParser";
     attr->type = schema::ActivationType_RELU;
-
   } else if (std::strcmp(node_name,  "Relu6") == 0) {
     MS_LOG(DEBUG) << "parse TfliteRelu6Parser";
     attr->type = schema::ActivationType_RELU6;

mindspore/lite/tools/converter/parser/tflite/tflite_l2norm_parser.cc

@@ -51,10 +51,6 @@ STATUS TfliteL2NormParser::Parse(const std::unique_ptr<tflite::OperatorT> &tflit
     return RET_NULL_PTR;
   }
   auto data_index = tflite_op->inputs[0];
-  if (static_cast<int>(tflite_op->inputs.size()) <= data_index) {
-    MS_LOG(ERROR) << "the size of input should be greater than " << data_index;
-    return RET_ERROR;
-  }
   const auto &data_tensor = tflite_tensors[data_index];
   if (data_tensor == nullptr) {
     MS_LOG(ERROR) << "the input tensor is null";

mindspore/lite/tools/converter/parser/tflite/tflite_reshape_parser.cc

@@ -57,9 +57,16 @@ STATUS TfliteReshapeParser::Parse(const std::unique_ptr<tflite::OperatorT> &tfli
       MS_LOG(ERROR) << "shape_tensor is null";
       return RET_NULL_PTR;
     }
-    if (GetTfliteData(tflite_op->inputs[1], tflite_tensors, tflite_model_buffer, attr->shape)) {
-      MS_LOG(ERROR) << "get reshape -> shape failed";
-      return RET_ERROR;
+    auto &buf_data = tflite_model_buffer[shape_tensor->buffer];
+    if (buf_data == nullptr) {
+      MS_LOG(ERROR) << "buf_data is null";
+      return RET_NULL_PTR;
+    }
+    if (!buf_data->data.empty()) {
+      if (GetTfliteData(tflite_op->inputs[1], tflite_tensors, tflite_model_buffer, attr->shape)) {
+        MS_LOG(ERROR) << "get reshape -> shape failed";
+        return RET_ERROR;
+      }
     }
   } else {
     attr->format = schema::Format_NHWC;