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Clarify randomness and reproducibility of CSA operations #29

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Clarify randomness and reproducibility of CSA operations #29

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12 changes: 12 additions & 0 deletions csa/_elementary.py
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@@ -1,3 +1,15 @@
"""
Randomness and reproducibility
------------------------------
This module relies on Python's global random number generator.
Random values are drawn from the current RNG state and the RNG
is not re-seeded on each call.

As a result, repeated CSA operations (e.g. random/block-style
masks) with identical parameters may produce different
realizations unless the user explicitly sets a random seed
using ``random.seed(...)`` before invoking them.
"""
#
# This file is part of the Connection-Set Algebra (CSA).
# Copyright (C) 2010,2011,2012 Mikael Djurfeldt
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