update readme.md

README.md

@@ -21,3 +21,13 @@ Example image:
 Expected output:
     loading pretrained model from ./data/crnn.pth
     a-----v--a-i-l-a-bb-l-ee-- => available
+
+Dependence
+----------
+* [warp_ctc_pytorch](https://github.com/SeanNaren/warp-ctc/tree/pytorch_bindings/pytorch_binding)
+* lmdb
+
+Train a new model
+-----------------
+1. Construct dataset following origin guide. For training with variable length, please sort the image according to the text length.
+2. ``python crnn_main.py [--param val]``. Explore ``crnn_main.py`` for details.