mirror of https://github.com/hpcaitech/ColossalAI
79 lines
3.0 KiB
Python
79 lines
3.0 KiB
Python
import torch
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from .op_wrapper import _COLOSSAL_OPS
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from typing import Tuple
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class ColoTensor(object):
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""" Data Structure for Tensor in Colossal-AI
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1. It contains a torch.Tensor as an attribute.
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2. It supports lazy init the tensor's payload.
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3. It can hijack the torch functions which using ColoTensors as args to our customized functions.
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4. It supports distributing the tensor's payload to the shards among processes. (TODO)
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"""
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def __new__(cls, *args, **kwargs):
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return super(ColoTensor, cls).__new__(cls)
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def __init__(
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self,
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*size: Tuple[int],
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dtype=None,
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requires_grad=False,
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pin_memory=False,
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device=None,
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torch_tensor=torch.empty(0),
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):
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self._size = size
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self._dtype = dtype
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self._requires_grad = requires_grad
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self._pin_memory = pin_memory
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self._device = device
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self._torch_tensor = torch_tensor
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def numel(self):
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return sum(self._size)
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@staticmethod
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def init_from_torch_tensor(tensor: torch.Tensor, save_payload=True) -> 'ColoTensor':
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colo_t = ColoTensor(*tensor.size(),
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dtype=tensor.dtype,
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requires_grad=tensor.requires_grad,
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pin_memory=tensor.is_pinned(),
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device=tensor.device,
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torch_tensor=tensor if save_payload else torch.empty(0))
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return colo_t
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def del_torch_tensor(self, save_shape=False) -> None:
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if save_shape:
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self._size = (0,)
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self._torch_tensor = torch.empty((0,))
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def torch_tensor(self) -> torch.Tensor:
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if self._torch_tensor.numel() == 0:
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self._torch_tensor = torch.empty(*self._size,
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dtype=self._dtype,
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pin_memory=self._pin_memory,
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requires_grad=self._requires_grad,
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device=self._device)
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return self._torch_tensor
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@classmethod
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def __torch_function__(cls, func, types, args=(), kwargs=None):
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global _COLOSSAL_OPS
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if func in _COLOSSAL_OPS:
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for arg in args:
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if isinstance(arg, ColoTensor):
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return _COLOSSAL_OPS[func](types, args, kwargs, None)
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for kwarg in kwargs.values():
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if isinstance(kwarg, ColoTensor):
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return _COLOSSAL_OPS[func](types, args, kwargs, None)
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else:
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# If we have not hijact the function, convert the ColoTensors in args and kwargs to torch tensors.
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args = [arg.torch_tensor() if isinstance(arg, ColoTensor) else arg for arg in args]
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if kwargs is None:
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kwargs = {}
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kwargs = {k: v.torch_tensor() if isinstance(v, ColoTensor) else v for k, v in kwargs.items()}
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return func(*args, **kwargs)
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