!7188 Change FC Quantization Method

Merge pull request !7188 from liuxiao78/master

mindspore/lite/tools/converter/quantizer/quantize_util.h

@@ -123,10 +123,15 @@ STATUS QuantFilter(ParamValueLitePtr weight, std::shared_ptr<PrimitiveC> primiti
                    int quant_max, int quant_min, size_t bitNum, bool per_channel) {
   auto dims = weight->tensor_shape();
   if (per_channel) {
-    if (dims.size() != 4) {
+    if (dims.size() != 4 && dims.size() != 2) {
       MS_LOG(INFO) << "weight dims size: " << dims.size() << " switch to per-layer quant mode.";
       per_channel = false;
     } else {
+      auto op_type = (schema::PrimitiveType)primitive_c->Type();
+      if (dims.size() == 2 && op_type != schema::PrimitiveType_FullConnection) {
+        MS_LOG(INFO) << "weight dims size is 2 but op_type is not FullConnection, switch to per-layer quant mode.";
+        per_channel = false;
+      }
       uint32_t channels = dims[0];
       if (channels == 0) {
         MS_LOG(ERROR) << "channels is 0";