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88 lines
3.0 KiB
88 lines
3.0 KiB
# coding=utf-8
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# Implements stream chat in command line for fine-tuned models.
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# Usage: python cli_demo.py --model_name_or_path path_to_model --checkpoint_dir path_to_checkpoint
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from utils import (
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load_pretrained,
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prepare_infer_args,
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get_logits_processor
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)
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from threading import Thread
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from transformers import TextIteratorStreamer
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def main():
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model_args, data_args, finetuning_args = prepare_infer_args()
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model_name = "BLOOM" if "bloom" in model_args.model_name_or_path else "LLaMA"
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model, tokenizer = load_pretrained(model_args, finetuning_args)
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def format_example_alpaca(query, history):
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prompt = "Below is an instruction that describes a task. "
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prompt += "Write a response that appropriately completes the request.\n"
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prompt += "Instruction:\n"
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for old_query, response in history:
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prompt += "Human: {}\nAssistant: {}\n".format(old_query, response)
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prompt += "Human: {}\nAssistant:".format(query)
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return prompt
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def format_example_ziya(query, history):
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prompt = ""
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for old_query, response in history:
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prompt += "<human>: {}\n<bot>: {}\n".format(old_query, response)
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prompt += "<human>: {}\n<bot>:".format(query)
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return prompt
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format_example = format_example_alpaca if data_args.prompt_template == "alpaca" else format_example_ziya
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streamer = TextIteratorStreamer(tokenizer, timeout=60.0, skip_prompt=True, skip_special_tokens=True)
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def predict_and_print(query, history: list):
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input_ids = tokenizer([format_example(query, history)], return_tensors="pt")["input_ids"]
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input_ids = input_ids.to(model.device)
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gen_kwargs = {
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"input_ids": input_ids,
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"do_sample": True,
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"top_p": 0.7,
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"temperature": 0.95,
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"num_beams": 1,
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"max_new_tokens": 512,
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"repetition_penalty": 1.0,
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"logits_processor": get_logits_processor(),
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"streamer": streamer
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}
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thread = Thread(target=model.generate, kwargs=gen_kwargs)
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thread.start()
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response = ""
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print("{}: ".format(model_name), end="")
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for new_text in streamer:
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print(new_text, end="", flush=True)
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response += new_text
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print()
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history = history + [(query, response)]
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return history
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history = []
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print("欢迎使用 {} 模型，输入内容即可对话，clear清空对话历史，stop终止程序".format(model_name))
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while True:
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try:
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query = input("\nInput: ")
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except UnicodeDecodeError:
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print("Detected decoding error at the inputs, please set the terminal encoding to utf-8.")
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continue
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except Exception:
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raise
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if query.strip() == "stop":
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break
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if query.strip() == "clear":
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history = []
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print("History has been removed.")
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continue
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history = predict_and_print(query, history)
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if __name__ == "__main__":
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main()
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