!7977 fix bugs in onnx group conv parser and cast operator

Merge pull request !7977 from XianglongZeng/myms

mindspore/lite/src/runtime/kernel/arm/fp32/cast.cc

@@ -83,8 +83,7 @@ int CastCPUKernel::DoCast(int thread_id) {
     } else if (input_data_type == kNumberTypeInt32 && output_data_type == kNumberTypeInt64) {
       Int32ToInt64(reinterpret_cast<int32_t *>(input->data_c()) + offset,
                    reinterpret_cast<int64_t *>(output_data) + offset, data_num);
-    } else if (input_data_type == kNumberTypeInt32 &&
-               (output_data_type == kNumberTypeInt32 || output_data_type == kNumberTypeInt64)) {
+    } else if (input_data_type == kNumberTypeInt32 && output_data_type == kNumberTypeInt32) {
       memcpy(reinterpret_cast<int32_t *>(output_data) + offset, reinterpret_cast<int32_t *>(input->data_c()) + offset,
              data_num * sizeof(int32_t));
     } else {

mindspore/lite/tools/converter/parser/onnx/onnx_conv_parser.cc

@@ -172,7 +172,7 @@ STATUS OnnxConvParser::Parse(const onnx::GraphProto &onnx_graph, const onnx::Nod
     attr->activationType = schema::ActivationType_NO_ACTIVATION;
   }
 
-  if (attr->group > kSingleGrounp) {
+  if (attr->group > kSingleGrounp && attr->group == attr->channelIn) {
     if (!ParseGroupConvolution(attr, op)) {
       MS_LOG(ERROR) << "Convert Convolution to Depthwise failed";
       return RET_ERROR;