Create README.md

README.md

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+West et al.'s model from their "reflective decoding" paper. 
+
+Sample usage: 
+
+```python
+import torch
+from modeling_opengpt2 import OpenGPT2LMHeadModel
+from padded_encoder import Encoder
+
+path_to_backward = 'danyaljj/opengpt2_pytorch_backward'
+
+encoder = Encoder()
+model_backward = OpenGPT2LMHeadModel.from_pretrained(path_to_backward)
+
+input = "until she finally won."
+input_ids = encoder.encode(input)
+input_ids = torch.tensor([input_ids[::-1] ], dtype=torch.int)
+print(input_ids)
+
+output = model_backward.generate(input_ids)
+
+output_text = encoder.decode(output.tolist()[0][::-1])
+
+print(output_text)
+```
+
+Download the additional files from here: https://github.com/peterwestuw/GPT2ForwardBackward
+