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| import os | |
| from transformers import TextGenerationPipeline | |
| from transformers.pipelines.text_generation import ReturnType | |
| from stopping import get_stopping | |
| from prompter import Prompter, PromptType | |
| class H2OTextGenerationPipeline(TextGenerationPipeline): | |
| def __init__(self, *args, debug=False, chat=False, stream_output=False, | |
| sanitize_bot_response=False, | |
| use_prompter=True, prompter=None, | |
| context='', iinput='', | |
| prompt_type=None, prompt_dict=None, | |
| max_input_tokens=2048 - 256, **kwargs): | |
| """ | |
| HF-like pipeline, but handle instruction prompting and stopping (for some models) | |
| :param args: | |
| :param debug: | |
| :param chat: | |
| :param stream_output: | |
| :param sanitize_bot_response: | |
| :param use_prompter: Whether to use prompter. If pass prompt_type, will make prompter | |
| :param prompter: prompter, can pass if have already | |
| :param prompt_type: prompt_type, e.g. human_bot. See prompt_type to model mapping in from prompter.py. | |
| If use_prompter, then will make prompter and use it. | |
| :param prompt_dict: dict of get_prompt(, return_dict=True) for prompt_type=custom | |
| :param max_input_tokens: | |
| :param kwargs: | |
| """ | |
| super().__init__(*args, **kwargs) | |
| self.prompt_text = None | |
| self.use_prompter = use_prompter | |
| self.prompt_type = prompt_type | |
| self.prompt_dict = prompt_dict | |
| self.prompter = prompter | |
| self.context = context | |
| self.iinput = iinput | |
| if self.use_prompter: | |
| if self.prompter is not None: | |
| assert self.prompter.prompt_type is not None | |
| else: | |
| self.prompter = Prompter(self.prompt_type, self.prompt_dict, debug=debug, chat=chat, | |
| stream_output=stream_output) | |
| self.human = self.prompter.humanstr | |
| self.bot = self.prompter.botstr | |
| self.can_stop = True | |
| else: | |
| self.prompter = None | |
| self.human = None | |
| self.bot = None | |
| self.can_stop = False | |
| self.sanitize_bot_response = sanitize_bot_response | |
| self.max_input_tokens = max_input_tokens # not for generate, so ok that not kwargs | |
| def limit_prompt(prompt_text, tokenizer, max_prompt_length=None): | |
| verbose = bool(int(os.getenv('VERBOSE_PIPELINE', '0'))) | |
| if hasattr(tokenizer, 'model_max_length'): | |
| # model_max_length only defined for generate.py, not raw use of h2oai_pipeline.py | |
| model_max_length = tokenizer.model_max_length | |
| if max_prompt_length is not None: | |
| model_max_length = min(model_max_length, max_prompt_length) | |
| # cut at some upper likely limit to avoid excessive tokenization etc | |
| # upper bound of 10 chars/token, e.g. special chars sometimes are long | |
| if len(prompt_text) > model_max_length * 10: | |
| len0 = len(prompt_text) | |
| prompt_text = prompt_text[-model_max_length * 10:] | |
| if verbose: | |
| print("Cut of input: %s -> %s" % (len0, len(prompt_text)), flush=True) | |
| else: | |
| # unknown | |
| model_max_length = None | |
| num_prompt_tokens = None | |
| if model_max_length is not None: | |
| # can't wait for "hole" if not plain prompt_type, since would lose prefix like <human>: | |
| # For https://github.com/h2oai/h2ogpt/issues/192 | |
| for trial in range(0, 3): | |
| prompt_tokens = tokenizer(prompt_text)['input_ids'] | |
| num_prompt_tokens = len(prompt_tokens) | |
| if num_prompt_tokens > model_max_length: | |
| # conservative by using int() | |
| chars_per_token = int(len(prompt_text) / num_prompt_tokens) | |
| # keep tail, where question is if using langchain | |
| prompt_text = prompt_text[-model_max_length * chars_per_token:] | |
| if verbose: | |
| print("reducing %s tokens, assuming average of %s chars/token for %s characters" % ( | |
| num_prompt_tokens, chars_per_token, len(prompt_text)), flush=True) | |
| else: | |
| if verbose: | |
| print("using %s tokens with %s chars" % (num_prompt_tokens, len(prompt_text)), flush=True) | |
| break | |
| # Why Below False: don't limit max_new_tokens more, just rely upon stopping to reach limit of model | |
| if False: | |
| # if input prompt is some number of tokens, despite user request, can't have max_new_tokens more | |
| # | |
| assert num_prompt_tokens is not None | |
| if self.prompt_type not in [PromptType.plain.name, PromptType.plain.value]: | |
| # then give room for prompt | |
| fudge = 20 | |
| else: | |
| fudge = 0 | |
| max_new_tokens = max(0, min(generate_kwargs['max_new_tokens'], | |
| model_max_length - (num_prompt_tokens + fudge))) | |
| if max_new_tokens < generate_kwargs['max_new_tokens']: | |
| if verbose: | |
| print("Reduced max_new_tokens from %s -> %s" % ( | |
| generate_kwargs['max_new_tokens'], max_new_tokens)) | |
| generate_kwargs['max_new_tokens'] = max_new_tokens | |
| return prompt_text, num_prompt_tokens | |
| def preprocess(self, prompt_text, prefix="", handle_long_generation=None, **generate_kwargs): | |
| prompt_text, num_prompt_tokens = H2OTextGenerationPipeline.limit_prompt(prompt_text, self.tokenizer) | |
| data_point = dict(context=self.context, instruction=prompt_text, input=self.iinput) | |
| if self.prompter is not None: | |
| prompt_text = self.prompter.generate_prompt(data_point) | |
| self.prompt_text = prompt_text | |
| if handle_long_generation is None: | |
| # forces truncation of inputs to avoid critical failure | |
| handle_long_generation = None # disable with new approaches | |
| return super().preprocess(prompt_text, prefix=prefix, handle_long_generation=handle_long_generation, | |
| **generate_kwargs) | |
| def postprocess(self, model_outputs, return_type=ReturnType.FULL_TEXT, clean_up_tokenization_spaces=True): | |
| records = super().postprocess(model_outputs, return_type=return_type, | |
| clean_up_tokenization_spaces=clean_up_tokenization_spaces) | |
| for rec in records: | |
| if self.use_prompter: | |
| outputs = rec['generated_text'] | |
| outputs = self.prompter.get_response(outputs, prompt=self.prompt_text, | |
| sanitize_bot_response=self.sanitize_bot_response) | |
| elif self.bot and self.human: | |
| outputs = rec['generated_text'].split(self.bot)[1].split(self.human)[0] | |
| else: | |
| outputs = rec['generated_text'] | |
| rec['generated_text'] = outputs | |
| print("prompt: %s\noutputs: %s\n\n" % (self.prompt_text, outputs), flush=True) | |
| return records | |
| def _forward(self, model_inputs, **generate_kwargs): | |
| if self.can_stop: | |
| stopping_criteria = get_stopping(self.prompt_type, self.prompt_dict, | |
| self.tokenizer, self.device, | |
| human=self.human, bot=self.bot, | |
| model_max_length=self.tokenizer.model_max_length) | |
| generate_kwargs['stopping_criteria'] = stopping_criteria | |
| # return super()._forward(model_inputs, **generate_kwargs) | |
| return self.__forward(model_inputs, **generate_kwargs) | |
| # FIXME: Copy-paste of original _forward, but removed copy.deepcopy() | |
| # FIXME: https://github.com/h2oai/h2ogpt/issues/172 | |
| def __forward(self, model_inputs, **generate_kwargs): | |
| input_ids = model_inputs["input_ids"] | |
| attention_mask = model_inputs.get("attention_mask", None) | |
| # Allow empty prompts | |
| if input_ids.shape[1] == 0: | |
| input_ids = None | |
| attention_mask = None | |
| in_b = 1 | |
| else: | |
| in_b = input_ids.shape[0] | |
| prompt_text = model_inputs.pop("prompt_text") | |
| ## If there is a prefix, we may need to adjust the generation length. Do so without permanently modifying | |
| ## generate_kwargs, as some of the parameterization may come from the initialization of the pipeline. | |
| # generate_kwargs = copy.deepcopy(generate_kwargs) | |
| prefix_length = generate_kwargs.pop("prefix_length", 0) | |
| if prefix_length > 0: | |
| has_max_new_tokens = "max_new_tokens" in generate_kwargs or ( | |
| "generation_config" in generate_kwargs | |
| and generate_kwargs["generation_config"].max_new_tokens is not None | |
| ) | |
| if not has_max_new_tokens: | |
| generate_kwargs["max_length"] = generate_kwargs.get("max_length") or self.model.config.max_length | |
| generate_kwargs["max_length"] += prefix_length | |
| has_min_new_tokens = "min_new_tokens" in generate_kwargs or ( | |
| "generation_config" in generate_kwargs | |
| and generate_kwargs["generation_config"].min_new_tokens is not None | |
| ) | |
| if not has_min_new_tokens and "min_length" in generate_kwargs: | |
| generate_kwargs["min_length"] += prefix_length | |
| # BS x SL | |
| generated_sequence = self.model.generate(input_ids=input_ids, attention_mask=attention_mask, **generate_kwargs) | |
| out_b = generated_sequence.shape[0] | |
| if self.framework == "pt": | |
| generated_sequence = generated_sequence.reshape(in_b, out_b // in_b, *generated_sequence.shape[1:]) | |
| elif self.framework == "tf": | |
| from transformers import is_tf_available | |
| if is_tf_available(): | |
| import tensorflow as tf | |
| generated_sequence = tf.reshape(generated_sequence, | |
| (in_b, out_b // in_b, *generated_sequence.shape[1:])) | |
| else: | |
| raise ValueError("TF not avaialble.") | |
| return {"generated_sequence": generated_sequence, "input_ids": input_ids, "prompt_text": prompt_text} | |