Add ./ to --checkpoint_inception (#1951)

Fixes #1841

attention_ocr/README.md

@@ -65,7 +65,7 @@ To train a model using pre-trained Inception weights as initialization:
 ```
 wget http://download.tensorflow.org/models/inception_v3_2016_08_28.tar.gz
 tar xf inception_v3_2016_08_28.tar.gz
-python train.py --checkpoint_inception=inception_v3.ckpt
+python train.py --checkpoint_inception=./inception_v3.ckpt
 ```
 
 To fine tune the Attention OCR model using a checkpoint: