wehub-resource-sync
80 lines
2.2 KiB
Python
80 lines
2.2 KiB
Python
# SPDX-License-Identifier: Apache-2.0
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# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
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from inspect import BoundArguments
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import torch
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from .types import LayerReloadingInfo, LayerTensors
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__all__ = [
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"get_layer_tensors",
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"get_layer_params_buffers",
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"get_layer_size",
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"has_device_tensors",
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"get_info_size",
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]
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def get_layer_tensors(layer: torch.nn.Module) -> dict[str, torch.Tensor]:
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"""Get all parameters and buffers from a module as a dict."""
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params, buffers = get_layer_params_buffers(layer)
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return params | buffers
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def get_layer_params_buffers(layer: torch.nn.Module) -> LayerTensors:
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"""Get all parameters and buffers of a module as a tuple of dicts."""
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return (
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{name: param for name, param in layer._parameters.items() if param is not None},
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{name: buffer for name, buffer in layer._buffers.items() if buffer is not None},
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)
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def get_layer_size(layer: torch.nn.Module) -> int:
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"""Calculate total number of elements across loadable tensors in a layer.
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Excludes SKIP_TENSORS (e.g. _expert_map) which are never moved to meta
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device and never loaded via weight_loader during layerwise reload.
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"""
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from .meta import SKIP_TENSORS
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return sum(
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tensor.numel()
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for name, tensor in get_layer_tensors(layer).items()
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if name not in SKIP_TENSORS
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)
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def has_device_tensors(bound_args: BoundArguments) -> bool:
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"""
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Return True if the loaded weights exist on an accelerator device
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Args:
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bound_args: args to load weights
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Returns:
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True if weights are on accelerator device
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"""
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return any(
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isinstance(value, torch.Tensor) and value.device.type not in ("meta", "cpu")
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for value in bound_args.arguments.values()
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)
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def get_info_size(info: LayerReloadingInfo) -> int:
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"""
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Calculate the number of bytes used by loaded weights for a given layer
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Args:
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info: layerwise info to get size of
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Returns:
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number of bytes used by loaded weights
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"""
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return sum(
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value.nbytes
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for _, args in info.loaded_weights
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for value in args.arguments.values()
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if isinstance(value, torch.Tensor) and value.device.type not in ("meta", "cpu")
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)
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