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BUG: fully reset cached RNG state for non-MT19937 RNGs #32062

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Merged
ngoldbaum merged 1 commit into from
Jul 22, 2026
+10 −1
Merged

BUG: fully reset cached RNG state for non-MT19937 RNGs #32062

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2 changes: 1 addition & 1 deletion numpy/random/mtrand.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -4833,7 +4833,7 @@ def seed(seed=None):
return _rand.seed(seed)
else:
bg_type = type(_rand._bit_generator)
_rand._bit_generator.state = bg_type(seed).state
_rand.set_state(bg_type(seed).state)

def get_bit_generator():
"""
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9 changes: 9 additions & 0 deletions numpy/random/tests/test_randomstate.py
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Expand Up @@ -2060,6 +2060,15 @@ def test_seed_alt_bit_gen(restore_singleton_bitgen):
assert state["state"]["inc"] != new_state["state"]["inc"]


@pytest.mark.thread_unsafe(reason="np.random.set_bit_generator affects global state")
def test_seed_alt_bit_gen_resets_gauss_cache(restore_singleton_bitgen):
np.random.set_bit_generator(PCG64(0))
np.random.seed(12345)
expected = np.random.standard_normal()
np.random.seed(12345)
assert np.random.standard_normal() == expected


@pytest.mark.thread_unsafe(reason="np.random.set_bit_generator affects global state")
def test_state_error_alt_bit_gen(restore_singleton_bitgen):
# GH 21808
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