Delete utils.py
Browse files
utils.py
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from transformers import OlmoModel, OlmoPreTrainedModel, GenerationMixin, AutoConfig, AutoModelForSequenceClassification
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from transformers.modeling_outputs import SequenceClassifierOutputWithPast
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import torch
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from peft import PeftModel, PeftConfig
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from transformers import AutoConfig
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import logging
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from contextlib import contextmanager
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# The custom model for using Olmo with a sequence classification task
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device = "cuda" if torch.cuda.is_available() else "cpu"
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class OlmoForSequenceClassification(OlmoPreTrainedModel, GenerationMixin):
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def __init__(self, config):
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# Check OlmoForCausalLM.__init__
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super().__init__(config)
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self.model = OlmoModel(config)
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self.num_labels = config.num_labels
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self.classifier = torch.nn.Linear(config.hidden_size, config.num_labels)
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# Initialize weights and apply final processing
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self.post_init()
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def forward(
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self,
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input_ids: torch.LongTensor = None,
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attention_mask: torch.Tensor | None = None,
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labels: torch.LongTensor | None = None,
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**kwargs,
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) -> SequenceClassifierOutputWithPast:
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outputs = self.model(
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input_ids=input_ids,
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attention_mask=attention_mask,
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**kwargs,
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)
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logits = self.classifier(outputs.last_hidden_state) # [B, N, H] => [B, N, C]
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pooled_logits = logits[:, -1] # NOTE: tokenizer.padding_side must be 'left'
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loss = None
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if labels is not None:
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loss = self.loss_function(
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logits=logits,
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labels=labels,
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pooled_logits=pooled_logits,
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config=self.config,
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)
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return SequenceClassifierOutputWithPast(
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loss=loss,
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logits=pooled_logits,
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past_key_values=outputs.past_key_values,
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hidden_states=outputs.hidden_states,
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attentions=outputs.attentions,
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)
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# The function for loading a fulltuning model
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def get_fulltuning_model(model_path, model_type="olmo"):
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if model_type == "olmo":
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model = OlmoForSequenceClassification.from_pretrained(
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model_path,
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trust_remote_code=True,
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torch_dtype=torch.float32,
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).to("cuda" if torch.cuda.is_available() else "cpu")
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model.eval()
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elif model_type == "pythia":
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cfg = AutoConfig.from_pretrained(model_path, num_labels=3)
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model = AutoModelForSequenceClassification.from_pretrained(
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model_path,
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config=cfg,
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torch_dtype=torch.float32,
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).to(device)
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else:
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raise ValueError(f"Unsupported model_type: {model_type}")
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return model
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# The following function is used to suppress a "missing or unexpected params" warning.
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# This warning is no reason for concern. It stems from the fact that the model is first loaded
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# without a classifier head, which is added afterwards.
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class DropLoadReport(logging.Filter):
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def filter(self, record: logging.LogRecord) -> bool:
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return "LOAD REPORT" not in record.getMessage()
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@contextmanager
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def suppress_load_report_only():
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f = DropLoadReport()
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names = [
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"transformers.modeling_utils",
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"transformers.modeling_tf_pytorch_utils",
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"transformers",
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]
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loggers = [logging.getLogger(n) for n in names]
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for lg in loggers:
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lg.addFilter(f)
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try:
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yield
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finally:
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for lg in loggers:
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lg.removeFilter(f)
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# The function for loading a softprompt model
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def get_peft_model(model_path, model_type="olmo"):
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peft_config = PeftConfig.from_pretrained(model_path)
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device = "cuda" if torch.cuda.is_available() else "cpu"
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if model_type == "olmo":
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config = AutoConfig.from_pretrained(
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peft_config.base_model_name_or_path,
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trust_remote_code=True,
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num_labels=2,
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)
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with suppress_load_report_only():
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base = OlmoForSequenceClassification.from_pretrained(
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peft_config.base_model_name_or_path,
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trust_remote_code=True,
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torch_dtype=torch.float32,
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config=config,
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).to(device)
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elif model_type == "pythia":
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config = AutoConfig.from_pretrained(
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peft_config.base_model_name_or_path,
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num_labels=2,
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)
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with suppress_load_report_only():
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base = AutoModelForSequenceClassification.from_pretrained(
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peft_config.base_model_name_or_path,
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config=config,
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torch_dtype=torch.float32,
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).to(device)
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else:
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raise ValueError(f"Unsupported model_type: {model_type}")
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with suppress_load_report_only():
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model = PeftModel.from_pretrained(base, model_path).to(device)
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model.eval()
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return model
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