!13066 [MD][usability] Fix batch_op log level

From: @xiefangqi
Reviewed-by: @liucunwei,@pandoublefeng
Signed-off-by: @liucunwei

mindspore/ccsrc/minddata/dataset/engine/datasetops/batch_op.cc

@@ -390,7 +390,7 @@ Status BatchOp::InvokeBatchMapFunc(TensorTable *input, TensorTable *output, CBat
         TensorRow output_batch;
         // If user returns a type that is neither a list nor an array, issue a error msg.
         if (!py::isinstance<py::list>(ret_tuple[i])) {
-          MS_LOG(ERROR) << "column: " << out_col_names_[i]
+          MS_LOG(INFO) << "column: " << out_col_names_[i]
                        << " returned by per_batch_map is not a list, this could lead to conversion failure.";
         }