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Fix LogicalRules type annotation. (Tuple[str] is a tuple with single element string, #3877

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Apr 22, 2024
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Fix LogicalRules type annotation. (Tuple[str] is a tuple with single element string, #3877

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8 changes: 4 additions & 4 deletions flax/linen/spmd.py
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Original file line number Diff line number Diff line change
Expand Up @@ -107,9 +107,9 @@ def _mesh_assignment_free(new_assignment, existing_assignments):


def _logical_to_mesh_axes(
array_dim_names: Optional[Sequence[Optional[str]]],
rules: Optional[LogicalRules] = None,
) -> Optional[List[Union[_UnassignedAxis, None, str, Tuple[str]]]]:
array_dim_names: Optional[Sequence[Optional[str]]],
rules: Optional[LogicalRules] = None,
) -> Optional[List[Union[_UnassignedAxis, None, str, Tuple[str, ...]]]]:
"""Same as logical_to_mesh_axes, but doesn't fill in _unassigned_axis."""
if array_dim_names is None:
return None
Expand All @@ -126,7 +126,7 @@ def _logical_to_mesh_axes(
if not isinstance(rules, (tuple, list)):
raise ValueError('Unknown axis rule specification type.')
# We assign mesh axes using a priority based ruleset over logical axis names.
result: List[Union[_UnassignedAxis, None, str, Tuple[str]]]
result: List[Union[_UnassignedAxis, None, str, Tuple[str, ...]]]
result = [_unassigned_axis] * len(array_dim_names)
for rule_model_name, rule_mesh_names in rules:
if rule_model_name in array_dim_names:
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6 changes: 4 additions & 2 deletions flax/typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -119,10 +119,12 @@ class Out(Generic[T]):

LogicalNames = Tuple[Union[str, None], ...]

LogicalRules = Sequence[Tuple[str, Union[str, Tuple[str], None]]]
# Maps each logical axis to physical mesh, can be either None (replicated),
# one physical axis or a tuple of physical axes.
LogicalRules = Sequence[Tuple[str, Union[str, Tuple[str, ...], None]]]
ArrayPytree = Any # pylint: disable=invalid-name
LogicalPartitionSpec = Any # pylint: disable=invalid-name
LogicalPartitionSpecPytree = Any # pylint: disable=invalid-name
PartitionSpecPytree = Any # pylint: disable=invalid-name

Sharding = Tuple[Optional[str], ...]
Sharding = Tuple[Optional[str], ...]
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