51 lines
1.6 KiB
Python
51 lines
1.6 KiB
Python
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from typing import Union
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import ixformer._C as ops
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import torch
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__all__ = ["solve", "ref_slove"]
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def ref_slove(
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A: torch.Tensor, B: torch.Tensor, *, left: bool = True, out: torch.Tensor = None
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):
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out = torch.linalg.solve(A, B, left=left)
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return out
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def solve(
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A: torch.Tensor, B: torch.Tensor, *, left: bool = True, out: torch.Tensor = None
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):
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"""
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Args:
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A: (..., n, n) torch.float
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B: (..., n) or (..., n, k) or (n,...) or (n, k) or (n) torch.float
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left: bool
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whether to solve the system AX=B or XA=B. Default: True, 目前只支持left =True
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out: (..., n, k) torch.float
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Returns:
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out: (..., n, k) torch.float
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"""
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n = A.shape[-1]
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batch_count = A.numel() // (n * n)
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if B.dim() == 1:
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k = 1
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elif B.dim() == 2:
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if A.dim() > 2 and B.shape == (batch_count, n):
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k = 1
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else:
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nid = 0 if left else 1
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k = B.shape[nid ^ 1]
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else:
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k = B.size(B.dim() - 1 if left else B.dim() - 2)
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if n <= 64 and k <= 64 and left:
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return ops.infer.solve(A, B, left)
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else:
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device = A.device
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cpu_A = A.cpu()
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cpu_B = B.cpu()
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cpu_res = ref_slove(A=cpu_A, B=cpu_B, left=left)
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return cpu_res.to(device)
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