Create README.md

README.md

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+Base model: [microsoft/DialoGPT-small](https://huggingface.co/microsoft/DialoGPT-small)
+
+Fine tuned for dialogue response generation on the [Persuasion For Good Dataset](https://gitlab.com/ucdavisnlp/persuasionforgood) (Wang et al., 2019)
+
+Three additional special tokens were added during the fine-tuning process:
+ - <|pad|> padding token
+ - <|user|> speaker control token to prompt user responses
+ - <|system|> speaker control token to prompt system responses
+ 
+ The following Dialogues were excluded:
+ - Those with donation amounts outside of the task range of [$0, $2].
+ - Those where a donation of 0 was made at the end of the task but a non-zero amount was pledged in the dialogue.
+ - Those with more than 800 words.
+ 
+ Stats:
+ - Training set: 519 dialogues
+ - Validation set: 58 dialogues
+ - ~20 utterances per dialogue