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98 lines
3.7 KiB
98 lines
3.7 KiB
import functools
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from typing import Any, Callable, Dict, List, Tuple, Type, Union
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import torch
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from colossalai.logging import get_dist_logger
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from colossalai.tensor.sharding_spec import ShardingSpec, ShardingSpecException
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__all__ = ['ignore_sharding_exception', 'pytree_map']
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def ignore_sharding_exception(func):
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"""
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A function wrapper to handle the ShardingSpecException in the function.
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If ShardingSpecException occurs, this function will return None.
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Usage:
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# mute the assertion error in the function
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@ignore_sharding_exception
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def do_something():
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...
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"""
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@functools.wraps(func)
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def wrapper(*args, **kwargs):
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try:
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logger = get_dist_logger()
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rst = func(*args, **kwargs)
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return rst
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except ShardingSpecException as e:
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logger.debug(e)
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return None
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return wrapper
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def check_sharding_spec_validity(sharding_spec: ShardingSpec, tensor: torch.Tensor):
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"""
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This function checks whether the ShardingSpec is valid for the physical tensor.
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This check includes 3 items:
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1. the sharding spec covers all dimensions of the physical tensor
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2. the sharding spec for each dimension is divisible by the number of devices.
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3. the sharding spec's entire shape must match the tensor shape
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#
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"""
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# make sure all dims are covered in sharding spec
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sharding_len = len(sharding_spec.sharding_sequence)
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tensor_num_dim = tensor.dim()
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num_devices_in_col = sharding_spec.device_mesh.mesh_shape[0]
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num_devices_in_row = sharding_spec.device_mesh.mesh_shape[1]
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assert sharding_len == tensor_num_dim, \
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f'The ShardingSpec ({sharding_spec.sharding_sequence}) is created for {sharding_len}-dimension tensor, but the given tensor is {tensor_num_dim}-dimension ({tensor.shape}).'
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# make sure the sharding is valid for each dim
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for i in range(tensor_num_dim):
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dim_size = tensor.shape[i]
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dim_spec = sharding_spec.sharding_sequence[i]
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if str(dim_spec).startswith('S'):
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devices_str = str(dim_spec).lstrip('S')
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num_devices = 1
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if '0' in devices_str:
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num_devices *= num_devices_in_col
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if '1' in devices_str:
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num_devices *= num_devices_in_row
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assert dim_size >= num_devices and dim_size % num_devices == 0, \
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f'The dimension at index {i} has value {dim_size}, but it is sharded over {num_devices} devices.'
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# make sure the entire shape matches the physical tensor shape
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assert sharding_spec.entire_shape == tensor.shape, \
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f'The entire_shape of the sharding spec {sharding_spec.entire_shape} does not match the tensor shape {tensor.shape}'
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def pytree_map(obj: Any, fn: Callable, process_types: Union[Type, Tuple[Type]] = (), map_all: bool = False) -> Any:
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"""process object recursively, like pytree
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Args:
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obj (:class:`Any`): object to process
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fn (:class:`Callable`): a function to process subobject in obj
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process_types (:class: `type | tuple[type]`): types to determine the type to process
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map_all (:class: `bool`): if map_all is True, then any type of element will use fn
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Returns:
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:class:`Any`: returns have the same structure of `obj` and type in process_types after map of `fn`
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"""
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if isinstance(obj, dict):
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return {k: pytree_map(obj[k], fn, process_types, map_all) for k in obj}
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elif isinstance(obj, tuple):
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return tuple(pytree_map(o, fn, process_types, map_all) for o in obj)
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elif isinstance(obj, list):
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return list(pytree_map(o, fn, process_types, map_all) for o in obj)
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elif isinstance(obj, process_types):
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return fn(obj)
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else:
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return fn(obj) if map_all else obj
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