Merge pull request #4554 from littletomatodonkey/r2.3/add_refer

[cherry-pick 4552] add reference

ppocr/modeling/backbones/rec_mv1_enhance.py

@@ -12,6 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# This code is refer from: https://github.com/PaddlePaddle/PaddleClas/blob/develop/ppcls/arch/backbone/legendary_models/pp_lcnet.py
+
 from __future__ import absolute_import
 from __future__ import division
 from __future__ import print_function