fix quant bug

mindspore/lite/tools/common/graph_util.cc

@@ -446,6 +446,9 @@ NodeIter InsertNodeBefore(schema::MetaGraphT *graphT, NodeIter existNodeIter, si
       MS_ASSERT(prim != nullptr);
       preTensor->dataType = prim->srcT;
       toAddTensor->dataType = prim->dstT;
+      if (prim->srcT == TypeId::kNumberTypeUInt8 && prim->dstT == TypeId::kNumberTypeInt8) {
+        preTensor->quantParams.front()->zeroPoint += 128;
+      }
     }
     graphT->allTensors.emplace_back(std::move(toAddTensor));
     size_t toAddTensorIdx = graphT->allTensors.size() - 1;
@@ -486,6 +489,9 @@ NodeIter InsertNodeBefore(schema::MetaGraphT *graphT, NodeIter existNodeIter, si
         MS_ASSERT(prim != nullptr);
         preTensor->dataType = prim->srcT;
         toAddTensor->dataType = prim->dstT;
+        if (prim->srcT == TypeId::kNumberTypeUInt8 && prim->dstT == TypeId::kNumberTypeInt8) {
+          preTensor->quantParams.front()->zeroPoint += 128;
+        }
       }
       graphT->allTensors.emplace_back(std::move(toAddTensor));
       size_t toAddTensorIdx = graphT->allTensors.size() - 1;
@@ -546,6 +552,9 @@ NodeIter InsertNodeAfter(schema::MetaGraphT *graphT, NodeIter existNodeIter, siz
       MS_ASSERT(prim != nullptr);
       postTensor->dataType = prim->srcT;
       toAddTensor->dataType = prim->dstT;
+      if (prim->dstT == TypeId::kNumberTypeUInt8 && prim->srcT == TypeId::kNumberTypeInt8) {
+        toAddTensor->quantParams.front()->zeroPoint += 128;
+      }
     }
     graphT->allTensors.emplace_back(std::move(toAddTensor));
     size_t toAddTensorIdx = graphT->allTensors.size() - 1;
@@ -613,6 +622,9 @@ NodeIter InsertNodeAfter(schema::MetaGraphT *graphT, NodeIter existNodeIter, siz
         MS_ASSERT(prim != nullptr);
         postTensor->dataType = prim->srcT;
         toAddTensor->dataType = prim->dstT;
+        if (prim->dstT == TypeId::kNumberTypeUInt8 && prim->srcT == TypeId::kNumberTypeInt8) {
+          toAddTensor->quantParams.front()->zeroPoint += 128;
+        }
       }
       graphT->allTensors.emplace_back(std::move(toAddTensor));
       size_t toAddTensorIdx = graphT->allTensors.size() - 1;