mirror of https://github.com/hpcaitech/ColossalAI
102 lines
3.0 KiB
Python
102 lines
3.0 KiB
Python
import torch
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import torch.fx
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from torch.fx.node import Node, map_aggregate
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from typing import Any, Tuple, NamedTuple, Optional, Dict
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from functools import reduce
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from torch.fx._compatibility import compatibility
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@compatibility(is_backward_compatible=True)
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class TensorMetadata(NamedTuple):
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# TensorMetadata is a structure containing pertinent information
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# about a tensor within a PyTorch program.
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shape: torch.Size
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dtype: torch.dtype
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requires_grad: bool
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stride: Tuple[int]
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numel: int
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# TODO: we can add a list of sharding spec here, and record the sharding
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# behaviour by appending sharding spec into list.
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def _extract_tensor_metadata(result: torch.Tensor) -> TensorMetadata:
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"""
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Extract a TensorMetadata NamedTuple describing `result`.
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"""
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shape = result.shape
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dtype = result.dtype
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requires_grad = result.requires_grad
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stride = result.stride()
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numel = result.numel()
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return TensorMetadata(shape, dtype, requires_grad, stride, numel)
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@compatibility(is_backward_compatible=True)
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class MetaInfoProp(torch.fx.Interpreter):
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"""
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Execute an FX graph Node-by-Node and
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record the shape and type of the result
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into the corresponding node.
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Usage:
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BATCH_SIZE = 2
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DIM_IN = 4
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DIM_OUT = 16
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model = torch.nn.Linear(DIM_IN, DIM_OUT)
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input_sample = torch.rand(BATCH_SIZE, DIM_IN)
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orig_output = model(input_sample)
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gm = symbolic_trace(model)
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MetaInfoProp(gm).run(input_sample)
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for node in gm.graph.nodes:
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print(node.name, node.meta['tensor_meta'].dtype,
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node.meta['tensor_meta'].shape, node.meta['tensor_meta'].numel)
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# output of above code is
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# input_1 torch.float32 torch.Size([2, 4]) 8
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# weight torch.float32 torch.Size([16, 4]) 64
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# bias torch.float32 torch.Size([16]) 16
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# linear torch.float32 torch.Size([2, 16]) 32
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# output torch.float32 torch.Size([2, 16]) 32
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Args:
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module (GraphModule): The module to be executed
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"""
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def run_node(self, n: Node) -> Any:
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result = super().run_node(n)
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found_tensor = False
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def extract_tensor_meta(obj):
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if isinstance(obj, torch.Tensor):
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nonlocal found_tensor
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found_tensor = True
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return _extract_tensor_metadata(obj)
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else:
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return obj
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meta = map_aggregate(result, extract_tensor_meta)
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if found_tensor:
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n.meta['tensor_meta'] = meta
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else:
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n.meta['tensor_meta'] = TensorMetadata(None, None, False, None, 0)
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n.meta['type'] = type(result)
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return result
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def propagate(self, *args):
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"""
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Run `module` via interpretation and return the result and
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record the shape and type of each node.
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Args:
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*args (Tensor): the sample input.
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Returns:
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Any: The value returned from executing the Module
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"""
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return super().run(*args)
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