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79 lines
2.3 KiB
Python
79 lines
2.3 KiB
Python
import json
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from typing import Any
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import torch
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from transformers import AutoModelForCausalLM, AutoTokenizer
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from transformers.quantizers import HfQuantizer, register_quantization_config, register_quantizer
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from transformers.utils.quantization_config import QuantizationConfigMixin
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@register_quantization_config("custom")
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class CustomConfig(QuantizationConfigMixin):
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def __init__(self):
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self.quant_method = "custom"
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self.bits = 8
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def to_dict(self) -> dict[str, Any]:
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output = {
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"num_bits": self.bits,
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}
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return output
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def __repr__(self):
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config_dict = self.to_dict()
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return f"{self.__class__.__name__} {json.dumps(config_dict, indent=2, sort_keys=True)}\n"
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def to_diff_dict(self) -> dict[str, Any]:
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config_dict = self.to_dict()
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default_config_dict = CustomConfig().to_dict()
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serializable_config_dict = {}
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for key, value in config_dict.items():
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if value != default_config_dict[key]:
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serializable_config_dict[key] = value
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return serializable_config_dict
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@register_quantizer("custom")
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class CustomQuantizer(HfQuantizer):
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def __init__(self, quantization_config: QuantizationConfigMixin, **kwargs):
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super().__init__(quantization_config, **kwargs)
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self.quantization_config = quantization_config
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self.scale_map = {}
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self.device = kwargs.get("device", "cuda" if torch.cuda.is_available() else "cpu")
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self.dtype = kwargs.get("dtype", torch.float32)
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def _process_model_before_weight_loading(self, model, **kwargs):
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return True
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def _process_model_after_weight_loading(self, model, **kwargs):
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return True
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def is_serializable(self) -> bool:
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return True
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def is_trainable(self) -> bool:
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return False
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model_8bit = AutoModelForCausalLM.from_pretrained(
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"facebook/opt-350m", quantization_config=CustomConfig(), dtype="auto"
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)
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tokenizer = AutoTokenizer.from_pretrained("facebook/opt-350m")
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input_text = "once there is"
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inputs = tokenizer(input_text, return_tensors="pt")
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output = model_8bit.generate(
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**inputs,
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max_length=100,
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num_return_sequences=1,
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no_repeat_ngram_size=2,
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)
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generated_text = tokenizer.decode(output[0], skip_special_tokens=True)
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print(generated_text)
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