Source code for jax._src.partition_spec

# Copyright 2021 The JAX Authors.
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# Licensed under the Apache License, Version 2.0 (the "License");
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#     https://www.apache.org/licenses/LICENSE-2.0
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class _UnconstrainedPartitionSingleton:

  def __str__(self):
    return "UNCONSTRAINED"


# Unconstrained sentinel value for PartitionSpec, representing a dimension for
# which the user wants XLA to assign the best partitioning.
# TODO(yashkatariya): May rename to AUTO.
_UNCONSTRAINED_PARTITION = _UnconstrainedPartitionSingleton()


[docs] class PartitionSpec(tuple): """Tuple describing how to partition an array across a mesh of devices. Each element is either ``None``, a string, or a tuple of strings. See the documentation of :class:`jax.sharding.NamedSharding` for more details. This class exists so JAX's pytree utilities can distinguish a partition specifications from tuples that should be treated as pytrees. """ # A sentinel value representing a dim is unconstrained. UNCONSTRAINED = _UNCONSTRAINED_PARTITION def __init__(self, *partitions): pass def __new__(cls, *partitions): return tuple.__new__(PartitionSpec, partitions) def __repr__(self): return "PartitionSpec%s" % tuple.__repr__(self) def __reduce__(self): return (PartitionSpec, tuple(self))