122 lines
3.3 KiB
Python
122 lines
3.3 KiB
Python
# Copyright (c) Facebook, Inc. and its affiliates.
|
|
# All rights reserved.
|
|
#
|
|
# This source code is licensed under the BSD-style license found in the
|
|
# LICENSE file in the root directory of this source tree.
|
|
import dis
|
|
import inspect
|
|
|
|
from dataclasses import dataclass
|
|
from typing import Union
|
|
|
|
from . import DimList
|
|
|
|
_vmap_levels = []
|
|
|
|
|
|
@dataclass
|
|
class LevelInfo:
|
|
level: int
|
|
alive: bool = True
|
|
|
|
|
|
class Dim:
|
|
def __init__(self, name: str, size: Union[None, int] = None):
|
|
self.name = name
|
|
self._size = None
|
|
self._vmap_level = None
|
|
if size is not None:
|
|
self.size = size
|
|
|
|
def __del__(self):
|
|
if self._vmap_level is not None:
|
|
_vmap_active_levels[self._vmap_stack].alive = False # noqa: F821
|
|
while (
|
|
not _vmap_levels[-1].alive
|
|
and current_level() == _vmap_levels[-1].level # noqa: F821
|
|
):
|
|
_vmap_decrement_nesting() # noqa: F821
|
|
_vmap_levels.pop()
|
|
|
|
@property
|
|
def size(self):
|
|
assert self.is_bound
|
|
return self._size
|
|
|
|
@size.setter
|
|
def size(self, size: int):
|
|
from . import DimensionBindError
|
|
|
|
if self._size is None:
|
|
self._size = size
|
|
self._vmap_level = _vmap_increment_nesting(size, "same") # noqa: F821
|
|
self._vmap_stack = len(_vmap_levels)
|
|
_vmap_levels.append(LevelInfo(self._vmap_level))
|
|
|
|
elif self._size != size:
|
|
raise DimensionBindError(
|
|
f"Dim '{self}' previously bound to a dimension of size {self._size} cannot bind to a dimension of size {size}"
|
|
)
|
|
|
|
@property
|
|
def is_bound(self):
|
|
return self._size is not None
|
|
|
|
def __repr__(self):
|
|
return self.name
|
|
|
|
|
|
def extract_name(inst):
|
|
assert inst.opname == "STORE_FAST" or inst.opname == "STORE_NAME"
|
|
return inst.argval
|
|
|
|
|
|
_cache = {}
|
|
|
|
|
|
def dims(lists=0):
|
|
frame = inspect.currentframe()
|
|
assert frame is not None
|
|
calling_frame = frame.f_back
|
|
assert calling_frame is not None
|
|
code, lasti = calling_frame.f_code, calling_frame.f_lasti
|
|
key = (code, lasti)
|
|
if key not in _cache:
|
|
first = lasti // 2 + 1
|
|
instructions = list(dis.get_instructions(calling_frame.f_code))
|
|
unpack = instructions[first]
|
|
|
|
if unpack.opname == "STORE_FAST" or unpack.opname == "STORE_NAME":
|
|
# just a single dim, not a list
|
|
name = unpack.argval
|
|
ctor = Dim if lists == 0 else DimList
|
|
_cache[key] = lambda: ctor(name=name)
|
|
else:
|
|
assert unpack.opname == "UNPACK_SEQUENCE"
|
|
ndims = unpack.argval
|
|
names = tuple(
|
|
extract_name(instructions[first + 1 + i]) for i in range(ndims)
|
|
)
|
|
first_list = len(names) - lists
|
|
_cache[key] = lambda: tuple(
|
|
Dim(n) if i < first_list else DimList(name=n)
|
|
for i, n in enumerate(names)
|
|
)
|
|
return _cache[key]()
|
|
|
|
|
|
def _dim_set(positional, arg):
|
|
def convert(a):
|
|
if isinstance(a, Dim):
|
|
return a
|
|
else:
|
|
assert isinstance(a, int)
|
|
return positional[a]
|
|
|
|
if arg is None:
|
|
return positional
|
|
elif not isinstance(arg, (Dim, int)):
|
|
return tuple(convert(a) for a in arg)
|
|
else:
|
|
return (convert(arg),)
|