!7380 fix bug in searching strategy of reshape

Merge pull request !7380 from yao_yf/reshape_strategy_search_fix

mindspore/ccsrc/frontend/parallel/ops_info/reshape_info.cc

@@ -423,6 +423,7 @@ void ReshapeInfo::SetCostForReshape(const mindspore::parallel::StrategyPtr &stra
     std::make_shared<StrategyWithCost>(strategy, inputs_tensor_info_, outputs_tensor_info_);
   swc->cost_list.push_back(result);
   strategy_cost_.emplace_back(swc);
+  ResetQueueMember();
 }
 
 Status ReshapeInfo::GenerateStrategies(int32_t stage_id) {

mindspore/ccsrc/frontend/parallel/tensor_layout/tensor_redistribution.cc

@@ -223,7 +223,8 @@ Status TensorRedistribution::ComputeCost() {
     } else {
       prev_shape = from_.tensor_shape().array();
     }
-    double prev_prod = std::accumulate(prev_shape.begin(), prev_shape.end(), 1, std::multiplies<int>());
+    double prev_prod =
+      std::accumulate(prev_shape.begin(), prev_shape.end(), static_cast<double>(1.0), std::multiplies<double>());
     computation_cost_ += 2.0 * prev_prod;
     memory_cost_ += 2.0 * prev_prod;
   }