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20 lines
699 B
Python
20 lines
699 B
Python
import torch
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try:
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from bitsandbytes.nn.modules import Params4bit
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bnb_available: bool = True
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except ImportError:
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bnb_available: bool = False
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def get_param_shape(param: torch.Tensor) -> torch.Size:
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"""A helper function to get the shape of a parameter that handles `bitsandbytes.nn.Params4Bit` correctly."""
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# Accessing the `.shape` attribute of `bitsandbytes.nn.Params4Bit` will return an incorrect result. Instead, we must
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# access the `.quant_state.shape` attribute.
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if bnb_available and type(param) is Params4bit: # type: ignore
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quant_state = param.quant_state
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if quant_state is not None:
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return quant_state.shape
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return param.shape
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