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Clarify Chain composition order #345

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Clarify Chain composition order #345

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7 changes: 4 additions & 3 deletions distrax/_src/bijectors/chain.py
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Expand Up @@ -28,8 +28,8 @@ class Chain(base.Bijector):
"""Composition of a sequence of bijectors into a single bijector.

Bijectors are composable: if `f` and `g` are bijectors, then `g o f` is also
a bijector. Given a sequence of bijectors `[f1, ..., fN]`, this class
implements the bijector defined by `fN o ... o f1`.
a bijector. Given a sequence of bijectors `[f1, ..., fN]`, this class applies
`fN` first and `f1` last, implementing `f1 o ... o fN`.

NOTE: the bijectors are applied in reverse order from the order they appear in
the sequence. For example, consider the following code where `f` and `g` are
Expand All @@ -49,7 +49,8 @@ def __init__(self, bijectors: Sequence[BijectorLike]):
"""Initializes a Chain bijector.

Args:
bijectors: a sequence of bijectors to be composed into one. Each bijector
bijectors: a sequence of bijectors to be composed into one, listed from
outermost to innermost. The last element is applied first. Each bijector
can be a distrax bijector, a TFP bijector, or a callable to be wrapped
by `Lambda`. The sequence must contain at least one bijector.
"""
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