ShaderEval.py

# Copyright 2020 The HuggingFace Datasets Authors and the current dataset script contributor.
#
# #TODO: license: MIT pending (evaluation suite itself can be completely open, nothing copyleft from the dataset reaches us here)
"""TODO: Add a description here."""

# TODO: Add BibTeX citation
_CITATION = """\
@InProceedings{huggingface:module,
title = {A great new module},
authors={huggingface, Inc.},
year={2023}
}
"""

# TODO: Add description of the module here
_DESCRIPTION = """\
This EvaluationSuite currently solves {1} tasks to test code intelligence of genereative language models for "creative programming" (fragment shaders).
"""




# via https://huggingface.co/docs/evaluate/evaluation_suite
import evaluate
from evaluate import evaluator #used by Suite.run()
from evaluate.evaluator.utils import DatasetColumn # used in .prepare_data()
from evaluate.evaluation_suite import SubTask
from datasets import Dataset
from typing import Any, Callable, Dict, List, Optional, Union # used in .prepare_pipeline()
import transformers
from transformers import Pipeline, pipeline, GenerationConfig, AutoTokenizer #GenerationConfig to specify greedy and avoid error
from datasets import load_dataset #used by Suite.run()

# write a custom evaluator, inherent from: https://github.com/huggingface/evaluate/blob/v0.4.0/src/evaluate/evaluator/text_generation.py#L31
class ReturnGenerationEvaluator(evaluate.TextGenerationEvaluator):
    def __init__(self, task="text-generation", default_metric_name="exact_match", predictions_prefix: str = "generated"):
        super().__init__(task=task, default_metric_name=default_metric_name)
        self.predictions_prefix = predictions_prefix

    greedy_cfg = GenerationConfig(
        do_sample = False, # default to ensure greedy
        num_beams = 1, # same as above
    )
    PIPELINE_KWARGS = {"return_full_text": False, "generation_config":greedy_cfg} #these kwargs are for the pipeline call, not the pipeline init - but that seems to still work.
    
    # for the pipeline init we need to copy the whole function and add two lines. this still prints errors due to the pad_toke_id = eos_token_id change.
    # from: https://github.com/huggingface/evaluate/blob/v0.4.0/src/evaluate/evaluator/base.py#L375
    def prepare_pipeline(
        self,
        model_or_pipeline: Union[str, "Pipeline", Callable, "PreTrainedModel", "TFPreTrainedModel"],  # noqa: F821
        tokenizer: Union["PreTrainedTokenizerBase", "FeatureExtractionMixin"] = None,  # noqa: F821
        feature_extractor: Union["PreTrainedTokenizerBase", "FeatureExtractionMixin"] = None,  # noqa: F821
        device: int = None,
    ):
        """
        Prepare pipeline.
        Args:
            model_or_pipeline (`str` or `Pipeline` or `Callable` or `PreTrainedModel` or `TFPreTrainedModel`,
            defaults to `None`):
                If the argument in not specified, we initialize the default pipeline for the task. If the argument is of the type `str` or
                is a model instance, we use it to initialize a new `Pipeline` with the given model. Otherwise we assume the
                argument specifies a pre-initialized pipeline.
            preprocessor (`PreTrainedTokenizerBase` or `FeatureExtractionMixin`, *optional*, defaults to `None`):
                Argument can be used to overwrite a default preprocessor if `model_or_pipeline` represents a model for
                which we build a pipeline. If `model_or_pipeline` is `None` or a pre-initialized pipeline, we ignore
                this argument.
        Returns:
            The initialized pipeline, with modifications for the specific task of generating text, even with long inputs.
        """

        if device is None:
            device = self._infer_device()

        if (
            isinstance(model_or_pipeline, str)
            or isinstance(model_or_pipeline, transformers.PreTrainedModel)
            or isinstance(model_or_pipeline, transformers.TFPreTrainedModel)
        ):
            if isinstance(model_or_pipeline, str):
                # load tokenizer manually, since the pipeline does fail to do so at times. needed for bigcode/santacoder for example.
                tokenizer = AutoTokenizer.from_pretrained(model_or_pipeline, trust_remote_code=True)
                
            pipe = pipeline(
                self.task,
                model=model_or_pipeline,
                tokenizer=tokenizer,
                feature_extractor=feature_extractor,
                device=device,
                # my additions here:
                handle_long_generation= "hole", #our solution? relevant: https://github.com/huggingface/transformers/issues/14033#issuecomment-948385227
                # pad_token_id=tokenizer.eos_token_id, #to avoid the warning, however there might be issues as tokenizers will call this differently.
                do_sample=False, #important to get reproduceable results but we need to make sure the generator is deterministic
                trust_remote_code=True, # do we need this for some custom models? need to test if it works right here. one example is bigcode/santacoder
            )
        else:
            if model_or_pipeline is None:
                pipe = pipeline(self.task, device=device)
            else:
                pipe = model_or_pipeline
            # if tokenizer is not None and feature_extractor is not None:
                # logger.warning("Ignoring the value of the preprocessor argument (`tokenizer` or `feature_extractor`).") #excluded warning because I didn't import logger
        if (pipe.task != self.task) and not (self.task == "translation" and pipe.task.startswith("translation")):
            raise ValueError(
                f"Incompatible `model_or_pipeline`. Please specify `model_or_pipeline` compatible with the `{self.task}` task."
            )
        
        # fixinging default for max_lenght 
        pipe.model.config.max_length = self._resolve_context_lenght(pipe=pipe)

        # update the generation config with information from the pipe
        self._update_generation_config(pipe)

        return pipe

    def _update_generation_config(self, pipe):
        """
        Update the generation config with information from the pipe. Sets eos_token_id and pad_token_id.
        Args:
            pipe (:class:`~transformers.Pipeline`): we need to access the tokenizer.vocab
        returns:
            None
        """
        semicolon_token_ids = [v for k,v in pipe.tokenizer.vocab.items() if ";" in k] # this requires the tokenizer, which we only have once a pipe is made.
        # GenerationConfig.update also exists, but it does only replace, not add kwargs.
        self.greedy_cfg.eos_token_id = semicolon_token_ids # eos_token_id can be a list, so we give them all possible tokens.
        self.greedy_cfg.pad_token_id = semicolon_token_ids[0] # pad_token_id has to be an int, so we just take the first one.
        return None # doesn't do anything?

    def _resolve_context_lenght(self, model_or_pipeline=None, pipe=None): #TODO should really copy the typing hints here.
        if isinstance(model_or_pipeline, transformers.GPT2Model): # you are comparing a string here -.-
            return model_or_pipeline.config.n_ctx # how GPT2 models might handle is, seen with 
        if pipe is not None: #should I figure out a way to pass this.
            return pipe.tokenizer.model_max_length # this is set to something small for pipeline default task, but we would want to put it to the max instead.
        # tokenizer needs to know the context length for our pipe strategy, but it has to be passed to the tokenizer, not model.
        # the tokenizer should read from the model config, but that can be wrong, or it has a task overwrite (for "text-generation" for example you get 50)
        #model_or_pipeline only exists via the .compute call, so we have to take it in
        # model_or_pipeline.tokenier.config.max_new_tokens = 1024 # we shouldn't return it, but overwrite the tokenizer config, which the pipeline relies on.

        return 1024 # we shouldn't return it, but overwrite the tokenizer config, which the pipeline relies on. 
    
    def _estimate_stopping(self, labels, **kwargs):
        """ estimates max_new_tokens for the pipeline call
            by counting the characters in the  longest string of the references adding 5 (for good measure but probably not needed)
        Args:
            labels: A list of dicts by knowing the labels
        Returns:
            `int`: the estimated max_new_tokens, should be smaller than context_lenght in all cases
        """
        context_lenght = self._resolve_context_lenght(**kwargs)
        estimate = min(max([len(ref) for ref in labels]) + 5, context_lenght) #does the min call get done inside the pipeline anyway? is there even a single case where the return statement is this long?
        return estimate

    # this one needs to be adjusted 
    def predictions_processor(self, predictions, *args, **kwargs):
        """
        processes the output of the pipeline to be compatible with the metric.
        generated texts cut off by the first semicolon and whitespaces are stripped (using python str builtins)
        Args:
            predictions: A list of lists of dicts
        Returns:
            `dict`: All the processed text are flattened and stored under the "predictions" key.
        """
        return {"predictions": [pred[f"{self.predictions_prefix}_text"].split(";")[0].strip() for pred_list in predictions for pred in pred_list]}
    
    # straight copy, doesn't seem to give me the 
    def prepare_data(self, data: Dataset, input_column: str, label_column: str, *args, **kwargs):
        """
        Prepare data.
        Args:
            data (`Dataset`): Specifies the dataset we will run evaluation on.
            input_column (`str`, defaults to `"text"`):
                the name of the column containing the text feature in the dataset specified by `data`.
            label_column (`str`, defaults to `"label"`):
                the name of the column containing the labels in the dataset specified by `data`.
        Returns:
            `dict`:  metric inputs. everything before the first semicolon and whitespaces are stripped (using python str builtins, just like the  pred prep)
            `list`:  pipeline inputs.
        """

        self.check_required_columns(data, {"input_column": input_column, "label_column": label_column}) #this will throw and exception with useful error messages
        
        # don't put everything in the return statement, so you have the control...
        references = [ref.split(";")[0].strip() for ref in data[label_column]]
        self.PIPELINE_KWARGS.update({"max_new_tokens": self._estimate_stopping(references)}) #this is a hack, does it work tho?

        return {"references": references}, data[input_column] #DatasetColumn(data, input_column) doesn't seem to work. data[input_column] does, but ignores any of the features of the helper class..



# via: https://huggingface.co/docs/evaluate/evaluation_suite
# relevant source: https://github.com/huggingface/evaluate/blob/v0.4.0/src/evaluate/evaluation_suite/__init__.py
class Suite(evaluate.EvaluationSuite):


    def __init__(self, name):
        super().__init__(name)
        self.preprocessor = lambda x: {"return_statement": x["return_statement"].split(";")[0]} #like this? refactored to RetrunGenerationEvaluator
        self.suite = [
            # more subtasks are only possible once we can pass custom evaluators. -> https://github.com/huggingface/evaluate/pull/367
            SubTask( #this one is adjusted already
                task_type="text-generation", #this call an evaluator, but can you specify your own custom evaluator instead?
                data="Vipitis/Shadertoys-fine",
                subset="return_completion",
                split="test", # use this to select a subset of the data during testing, perhaps remove later?
                args_for_task={
                    # "metric": "exact_match",
                    "input_column": "body",
                    "label_column": "return_statement",
                }
            )
        ]

    # from: https://github.com/huggingface/evaluate/blob/v0.4.0/src/evaluate/evaluation_suite/__init__.py#LL103C5-L129C27
    def run(
        self, model_or_pipeline: Union[str, "Pipeline", Callable, "PreTrainedModel", "TFPreTrainedModel"] = "Vipitis/CodeGPT-small-java-adaptedGPT2-transfer-shadertoys", #not so useful default model?
        snippet: int = "" # noqa: F821 
    ) -> Dict[str, float]:

        self.assert_suite_nonempty()

        results_all = []
        for task in self.suite:

            task_name = task.data

            if task.data_preprocessor:  # task requires extra preprocessing is all done inside the Evaluator
                ds = load_dataset(task.data, name=task.subset, split=(task.split + f"[:{snippet}]"))
                task.data = ds.map(task.data_preprocessor)

            task_evaluator = ReturnGenerationEvaluator() #this is the change we make: specify our custom evaluator from above.
            args_for_task = task.args_for_task
            args_for_task["model_or_pipeline"] = model_or_pipeline
            args_for_task["data"] = task.data
            args_for_task["subset"] = task.subset
            args_for_task["split"] = (task.split + f"[:{snippet}]") #make a downselection of the split via keywordarg in the .run() call?
            results = task_evaluator.compute(**args_for_task)

            results["model_cp"] = model_or_pipeline #added this to the output, should be useful. But be careful when passed something that is not a string. #TODO: currently the same for all tasks, maybe move to the list?
            results["task_name"] = task_name + "/" + task.subset if task.subset else task_name
            results["data_preprocessor"] = str(task.data_preprocessor) if task.data_preprocessor is not None else None
            results_all.append(results)
        return results_all