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fix: type hints #600

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f0321f6
fix: acquisition
phi-friday Feb 14, 2026
2044e35
fix: bayesian_optimization
phi-friday Feb 14, 2026
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24 changes: 12 additions & 12 deletions bayes_opt/acquisition.py
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Original file line number Diff line number Diff line change
Expand Up @@ -99,13 +99,13 @@ def get_acquisition_params(self) -> dict[str, Any]:
)
raise NotImplementedError(error_msg)

def set_acquisition_params(self, **params) -> None:
def set_acquisition_params(self, params: dict[str, Any]) -> None:
"""
Set the parameters of the acquisition function.

Parameters
----------
**params : dict
params : dict
The parameters of the acquisition function.
"""
error_msg = (
Expand Down Expand Up @@ -553,7 +553,7 @@ def decay_exploration(self) -> None:
):
self.kappa = self.kappa * self.exploration_decay

def get_acquisition_params(self) -> dict:
def get_acquisition_params(self) -> dict[str, Any]:
"""Get the current acquisition function parameters.

Returns
Expand All @@ -567,7 +567,7 @@ def get_acquisition_params(self) -> dict:
"exploration_decay_delay": self.exploration_decay_delay,
}

def set_acquisition_params(self, params: dict) -> None:
def set_acquisition_params(self, params: dict[str, Any]) -> None:
"""Set the acquisition function parameters.

Parameters
Expand Down Expand Up @@ -733,7 +733,7 @@ def decay_exploration(self) -> None:
):
self.xi = self.xi * self.exploration_decay

def get_acquisition_params(self) -> dict:
def get_acquisition_params(self) -> dict[str, Any]:
"""Get the current acquisition function parameters.

Returns
Expand All @@ -747,7 +747,7 @@ def get_acquisition_params(self) -> dict:
"exploration_decay_delay": self.exploration_decay_delay,
}

def set_acquisition_params(self, params: dict) -> None:
def set_acquisition_params(self, params: dict[str, Any]) -> None:
"""Set the acquisition function parameters.

Parameters
Expand Down Expand Up @@ -922,7 +922,7 @@ def decay_exploration(self) -> None:
):
self.xi = self.xi * self.exploration_decay

def get_acquisition_params(self) -> dict:
def get_acquisition_params(self) -> dict[str, Any]:
"""Get the current acquisition function parameters.

Returns
Expand All @@ -936,7 +936,7 @@ def get_acquisition_params(self) -> dict:
"exploration_decay_delay": self.exploration_decay_delay,
}

def set_acquisition_params(self, params: dict) -> None:
def set_acquisition_params(self, params: dict[str, Any]) -> None:
"""Set the acquisition function parameters.

Parameters
Expand Down Expand Up @@ -1147,7 +1147,7 @@ def suggest(

return x_max

def get_acquisition_params(self) -> dict:
def get_acquisition_params(self) -> dict[str, Any]:
"""Get the current acquisition function parameters.

Returns
Expand All @@ -1163,7 +1163,7 @@ def get_acquisition_params(self) -> dict:
"rtol": self.rtol,
}

def set_acquisition_params(self, params: dict) -> None:
def set_acquisition_params(self, params: dict[str, Any]) -> None:
"""Set the acquisition function parameters.

Parameters
Expand Down Expand Up @@ -1318,7 +1318,7 @@ def suggest(
idx = self._sample_idx_from_softmax_gains(random_state=random_state)
return x_max[idx]

def get_acquisition_params(self) -> dict:
def get_acquisition_params(self) -> dict[str, Any]:
"""Get the current acquisition function parameters.

Returns
Expand All @@ -1334,7 +1334,7 @@ def get_acquisition_params(self) -> dict:
else None,
}

def set_acquisition_params(self, params: dict) -> None:
def set_acquisition_params(self, params: dict[str, Any]) -> None:
"""Set the acquisition function parameters.

Parameters
Expand Down
14 changes: 7 additions & 7 deletions bayes_opt/bayesian_optimization.py
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Original file line number Diff line number Diff line change
Expand Up @@ -328,7 +328,7 @@ def probe(self, params: ParamsType, lazy: bool = True) -> None:
self._space.keys, self._space.res()[-1], self._space.params_config, self.max
)

def random_sample(self, n: int = 1) -> dict[str, float | NDArray[Float]]:
def random_sample(self, n: int = 1) -> list[dict[str, float | NDArray[Float]]]:
"""Generate a random sample of parameters from the target space.
Parameters
Expand Down Expand Up @@ -442,13 +442,13 @@ def save_state(self, path: str | PathLike[str]) -> None:
"""
random_state = None
if self._random_state is not None:
state_tuple = self._random_state.get_state()
state_dict = self._random_state.get_state(legacy=False)
random_state = {
"bit_generator": state_tuple[0],
"state": state_tuple[1].tolist(),
"pos": state_tuple[2],
"has_gauss": state_tuple[3],
"cached_gaussian": state_tuple[4],
"bit_generator": state_dict["bit_generator"],
"state": state_dict["state"]["key"].tolist(),
"pos": state_dict["state"]["pos"],
"has_gauss": state_dict["has_gauss"],
"cached_gaussian": state_dict["gauss"],
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@till-m till-m Feb 16, 2026

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Why don't the keys line up here ("cached_gaussian" vs "gauss")?

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@phi-friday phi-friday Feb 16, 2026

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I don't fully understand the meaning of each value, nor do I know the exact intention behind each method. Therefore, I preserved the keys as they were to avoid causing issues in other code that consumes this function's return value. I only changed the internal logic that depended on legacy.

My primary concern was errors occurring for users who were already using this method. So my goal was to maintain the existing return structure. When legacy=true, get_state returned a value with the following structure,

(
  "MT19937", 
  <numpy.ndarray>, 
  int, # like 623
  int, # like 0
  float # like 0.0
)

and when legacy=false, get_state returned a value with the following structure.

{
  "bit_generator": "MT19937",
  "state": {
    "key": <numpy.ndarray>,
    "pos": int # like 623
  },
  "has_gauss": int, # like 0
  "gauss": float # like 0.0
}

For that reason, I assumed gauss and cached_gauss were used with the same meaning. Using gauss instead of cached_gauss to align the numpy return value with the keys is also a good idea. However, it should be announced as a breaking change.

sample code

from pprint import pprint
from bayes_opt.bayesian_optimization import BayesianOptimization

bayes = BayesianOptimization(None, {})
legacy = bayes._random_state.get_state(legacy=True)
non_legacy = bayes._random_state.get_state(legacy=False)

print("Legacy state:")
pprint(legacy)
print("Non-legacy state:")
pprint(non_legacy)

output

Legacy state:
('MT19937',
 array([2147483648, 2075331599,  140858681, 3526623561, 2541108888,
       2106811263, 3519418634,  407860018, 2249244654, 2606184075,
       2786589483, 1437634829, 3069487802, 2325528976, 2221173448,
       4175430749,   60802753, 3831120806, 3576967720, 1467437066,
       3102226502, 1109303602, 4202242805, 3948013612, 3365853984,
       1662141710,  665954637, 3930982131,  573623358, 3534123242,
       1163249977, 1484804157, 2526724740, 4041334237,  303997122,
        467039403, 2604812076, 2662108352, 2700590779, 3149658310,
        475663908, 2698417034, 1437811983, 2453274244, 3934471757,
       1331634643, 3476886289, 1214548185, 2557676973,  841994067,
       1486750722, 1743267989, 2558066518, 1577953441, 2313272813,
        553286535, 1808628211, 2154155001, 1626207377, 3930160892,
       2129127017, 2082629614, 3872620351, 2201093007, 2516576609,
       1033987357, 2408204758,   15660947,  104784592,   59865213,
        186913512, 2677884128, 2060217906, 2669113803, 2011873750,
        208427217, 3680958504, 2179926499, 3166739308, 1431064049,
       2975913278, 1687432296, 1015884945, 1679512422, 4236327727,
        789327648, 2432065914, 3711318603, 2856411391, 3648323176,
       2833858325, 2966091895, 3017587410, 2267289704, 1257721755,
       1729437608, 1424227325, 2923596926, 1826322183,  368372361,
       1488204762, 1945476249,  562222798,  493888013, 2257447923,
        378468050, 2023039273, 3634128929, 2212812842, 3736007970,
       3181848715, 3253178714, 2247387434,  630298605,  168071064,
       2453990713, 2754709023,  158309059, 1693133287,  425567776,
        610244961, 1099495700, 1651920650, 4001234624, 4215841990,
       1597420538, 1371783983,  782335516,  955314030, 2124985108,
       1230992899, 2554470207,  178356559, 1538520927, 3123923199,
         98816670,   19339993, 1211323375, 2192833935, 3550014245,
       4079832419,  763245682, 3114649865,  637250886, 2346230918,
       1613897166,  900697267,  717509049, 3148396806,  860799586,
       2074079507, 3061186827, 2657283036, 1289050313,  224279970,
       2147563708, 1342253071, 1099805121, 1986459658,  451923538,
       4151091570, 4093933368, 1531334554, 2482301065, 3017676208,
       1552415979, 4080116605, 1391877515, 3326970419, 2087771436,
        881497654,  409221337, 2336918916, 3495750864,  505102391,
         87044493, 1374578224, 2345228469, 2677354761, 1686087426,
        350682568, 3896700142, 3387441124, 1322844580, 2035232113,
       4171743547, 2761364203,   87729543, 1543233909, 2006521429,
       1975119445,   37244549, 2381364078, 1787348020, 1892866190,
       4158911646, 2832543291, 2923372499,  933489775, 1999573074,
       1532857763, 3880893325, 2768633145, 1953348816, 3266441215,
       2573231980, 2998278938, 2040706335, 3623219627, 3178406798,
       4283796809, 1300309756, 1758157157, 4250966860, 2653105583,
       3650054898, 2689840365, 3155536137, 1503944792, 1147189469,
       3536335302, 3769476577, 2815860922, 4078024620, 2513323216,
       1902584155, 4129754107, 4152359938,  226115604,  851253201,
       4280862308,  180287939, 2460657108, 2761413323, 1164459732,
       4138592784, 1128464012, 2058279714,   28513951,  138939637,
       1445273851, 2902445187, 1819904997, 4126426761, 2232230179,
       1902241997, 1982429477, 3030253536, 2390946236,  836566848,
       2165522031, 2843209162, 1133455873,  547623528,  207067323,
       3740164691, 2956947873, 3885177903, 3602466789, 2265740401,
       2685171170, 2058459229,   95039846, 2428394435, 4085737081,
       1250884434, 2137775703, 3615871800,  736326573, 1908407987,
       3232375302, 4025275217, 3344578052,  419050246,  539900722,
        361845484, 2024236041, 1807301781, 2207338269, 1752779524,
       1862418620, 1495823156, 1133973867, 1296654836, 2940007730,
        949464795, 1328598876, 2353612020, 1256954613, 2085080443,
       3735562356, 4031242042, 2376353226, 1227464517, 3957619112,
       1276759908,  169813089, 2554310499, 2362132599,  734463866,
       2567295435, 3713429466, 1660269273, 2342554397, 1944535609,
       2590579477, 2663485021, 3446727181, 1776368335, 4209700934,
        325303151, 1020536745, 1713248288, 1413553117, 1011704881,
       3010455506,  867526459,  125872204, 2823501223,  315675245,
        664493829, 1193647001, 2902435491, 4008302996, 3293832381,
       2797902120,  921910079, 3875536258, 3860489956, 2859620526,
       4069365937, 3292188807, 1138527378, 1843896811,  907091389,
       2178070895, 1184356041, 2913034589,  533879758, 1047873800,
       4089462894,  468348870, 1858800455, 2604678205, 2354182895,
       4037991346, 3209323702, 3533093419, 1919473510, 2793616847,
       1700883469, 1788826146, 4071958955, 3386785762,   31514172,
         19250776, 2584513890, 3387325066, 2742147133, 3944682594,
        592591404, 2791260675, 2659746612,  315474544, 1904698953,
       2604266677,  353504318, 1964074412, 3514485156, 3169532567,
       2790485967, 1849610563, 1030849375, 1970983638,  988474342,
       3618121941, 2878575277, 2344105764, 2433708147, 3743911834,
       4228347785, 2663980549,  198679867,  251346502, 3680098503,
        717982583, 1991968231, 1966215759, 4175925001, 3436559417,
       2842484640, 1785986318, 3282130015, 4209173822, 3214474404,
       2458053183,  566868871, 4247691298, 1194533791,  413487128,
       2956434281, 1976050740, 2603640364, 4002305523, 2189933609,
       2235687021, 4111498140,  362578657, 3802239775, 1449348735,
       3201915429, 1621039138, 1260879657, 3685433319, 3748224261,
        515189256,   76609166, 4023105783, 1332479920, 1941260488,
       3789521841, 2649225611, 3982178583, 2640343581,  887753876,
       2623879481,  654393789, 3901261877, 4129195216, 2072705798,
       3926013998,  134872244, 3851146837,  949460971, 3028829716,
       2748465327,  658633327, 2567012781, 1903893367, 4261900666,
       3594114567, 3153823335, 1395439952, 2105875768,  381976650,
       3596252054, 2194541858, 1669787451, 1574190922, 2367623075,
       2588833298,   15549328, 3121584353, 1205559863, 4005798159,
        385823106, 1512495320, 2519004920, 3116316035, 1356388453,
       2213505697, 3940907241,  662747692, 4271952413, 2238060344,
       2185588921, 1133176214, 2634200703,  903739507, 1276798518,
       1983926732, 2154820370,  667506551, 1019684315, 2466082561,
        470204603, 1310064920, 1475141280,  245892548, 3605779030,
       2324199318, 3038548256, 2392772418, 3434801095, 1665423914,
       3361599793,  991532629,  203341667, 2271581211,  342113848,
       1314742753, 2606385127, 4012521188, 2525627142,   29727465,
       1440846172, 3385301785, 1416716301, 3139018885, 1029852703,
       4028502064, 3017404021, 2410613923, 3596475680, 2001792110,
       2708833257,   14648227, 1907913989, 1170726985, 3111440312,
        846965399, 3980136833,  588455565, 4078451876, 3074024037,
       2462917040, 2116906947, 3934436462, 2404005766,  326965248,
       1973564508,  247294817, 3955932918, 2643613999,  250186407,
       1225615873, 1839696651, 1566941656, 3381265620, 2592892272,
       1941384363, 3050443439, 3399139892, 1559644122, 3375602111,
       1882461001,  687452999, 1468410266, 2806653366, 1904450878,
         31291347, 2419739254, 1417596946, 1640466810, 1930448654,
       2936089149, 2312610571,  251748476,  437649019,  176021521,
       3372211891, 3436408750, 2737092954, 2371839491, 3899285718,
       1432435164, 1150021701,  294106891, 3716975008,  925497236,
        172267418, 3075465779,  601651008, 3068156317,  478671785,
        541454057, 3549429635, 3474732129, 3109897059, 2882340945,
        413340895, 1445184158,  659367875, 2246342184, 2990547884,
        612017351, 1742799743,  378185270,  144127691, 3292083012,
        257622965, 2144914484, 3497476539, 4118294021, 1412081876,
       1911936809,  216408794, 4261218624, 3956031618, 3845031202,
       4158384247, 3583716646, 2226653414, 3830924459, 2579468707,
       2114341243, 1811121245, 1825658109,  938532476,  156167731,
       3643681680, 3305159196, 2873238718, 2179049820, 1445742370,
       2797236726, 2573165619, 2478500615, 1701106298,  457138435,
         21172895, 3301268408,  750845870,  363451077, 1772226286,
       3727614291,  956968052,  250648236, 2185516024, 3583558949,
        781299039, 2536436898, 2114876194, 1369923866], dtype=uint32),
 623,
 0,
 0.0)
Non-legacy state:
{'bit_generator': 'MT19937',
 'gauss': 0.0,
 'has_gauss': 0,
 'state': {'key': array([2147483648, 2075331599,  140858681, 3526623561, 2541108888,
       2106811263, 3519418634,  407860018, 2249244654, 2606184075,
       2786589483, 1437634829, 3069487802, 2325528976, 2221173448,
       4175430749,   60802753, 3831120806, 3576967720, 1467437066,
       3102226502, 1109303602, 4202242805, 3948013612, 3365853984,
       1662141710,  665954637, 3930982131,  573623358, 3534123242,
       1163249977, 1484804157, 2526724740, 4041334237,  303997122,
        467039403, 2604812076, 2662108352, 2700590779, 3149658310,
        475663908, 2698417034, 1437811983, 2453274244, 3934471757,
       1331634643, 3476886289, 1214548185, 2557676973,  841994067,
       1486750722, 1743267989, 2558066518, 1577953441, 2313272813,
        553286535, 1808628211, 2154155001, 1626207377, 3930160892,
       2129127017, 2082629614, 3872620351, 2201093007, 2516576609,
       1033987357, 2408204758,   15660947,  104784592,   59865213,
        186913512, 2677884128, 2060217906, 2669113803, 2011873750,
        208427217, 3680958504, 2179926499, 3166739308, 1431064049,
       2975913278, 1687432296, 1015884945, 1679512422, 4236327727,
        789327648, 2432065914, 3711318603, 2856411391, 3648323176,
       2833858325, 2966091895, 3017587410, 2267289704, 1257721755,
       1729437608, 1424227325, 2923596926, 1826322183,  368372361,
       1488204762, 1945476249,  562222798,  493888013, 2257447923,
        378468050, 2023039273, 3634128929, 2212812842, 3736007970,
       3181848715, 3253178714, 2247387434,  630298605,  168071064,
       2453990713, 2754709023,  158309059, 1693133287,  425567776,
        610244961, 1099495700, 1651920650, 4001234624, 4215841990,
       1597420538, 1371783983,  782335516,  955314030, 2124985108,
       1230992899, 2554470207,  178356559, 1538520927, 3123923199,
         98816670,   19339993, 1211323375, 2192833935, 3550014245,
       4079832419,  763245682, 3114649865,  637250886, 2346230918,
       1613897166,  900697267,  717509049, 3148396806,  860799586,
       2074079507, 3061186827, 2657283036, 1289050313,  224279970,
       2147563708, 1342253071, 1099805121, 1986459658,  451923538,
       4151091570, 4093933368, 1531334554, 2482301065, 3017676208,
       1552415979, 4080116605, 1391877515, 3326970419, 2087771436,
        881497654,  409221337, 2336918916, 3495750864,  505102391,
         87044493, 1374578224, 2345228469, 2677354761, 1686087426,
        350682568, 3896700142, 3387441124, 1322844580, 2035232113,
       4171743547, 2761364203,   87729543, 1543233909, 2006521429,
       1975119445,   37244549, 2381364078, 1787348020, 1892866190,
       4158911646, 2832543291, 2923372499,  933489775, 1999573074,
       1532857763, 3880893325, 2768633145, 1953348816, 3266441215,
       2573231980, 2998278938, 2040706335, 3623219627, 3178406798,
       4283796809, 1300309756, 1758157157, 4250966860, 2653105583,
       3650054898, 2689840365, 3155536137, 1503944792, 1147189469,
       3536335302, 3769476577, 2815860922, 4078024620, 2513323216,
       1902584155, 4129754107, 4152359938,  226115604,  851253201,
       4280862308,  180287939, 2460657108, 2761413323, 1164459732,
       4138592784, 1128464012, 2058279714,   28513951,  138939637,
       1445273851, 2902445187, 1819904997, 4126426761, 2232230179,
       1902241997, 1982429477, 3030253536, 2390946236,  836566848,
       2165522031, 2843209162, 1133455873,  547623528,  207067323,
       3740164691, 2956947873, 3885177903, 3602466789, 2265740401,
       2685171170, 2058459229,   95039846, 2428394435, 4085737081,
       1250884434, 2137775703, 3615871800,  736326573, 1908407987,
       3232375302, 4025275217, 3344578052,  419050246,  539900722,
        361845484, 2024236041, 1807301781, 2207338269, 1752779524,
       1862418620, 1495823156, 1133973867, 1296654836, 2940007730,
        949464795, 1328598876, 2353612020, 1256954613, 2085080443,
       3735562356, 4031242042, 2376353226, 1227464517, 3957619112,
       1276759908,  169813089, 2554310499, 2362132599,  734463866,
       2567295435, 3713429466, 1660269273, 2342554397, 1944535609,
       2590579477, 2663485021, 3446727181, 1776368335, 4209700934,
        325303151, 1020536745, 1713248288, 1413553117, 1011704881,
       3010455506,  867526459,  125872204, 2823501223,  315675245,
        664493829, 1193647001, 2902435491, 4008302996, 3293832381,
       2797902120,  921910079, 3875536258, 3860489956, 2859620526,
       4069365937, 3292188807, 1138527378, 1843896811,  907091389,
       2178070895, 1184356041, 2913034589,  533879758, 1047873800,
       4089462894,  468348870, 1858800455, 2604678205, 2354182895,
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           'pos': 623}}

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@till-m till-m Feb 16, 2026

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okay, I see, it's for legacy compatibility. There is the option of breaking this also, but if you think this is the way to go, I'm happy to merge like this :)

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@phi-friday phi-friday Feb 16, 2026

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I think this is sufficient for now since this PR is for type safety, and if we were to change the structure of the random state, it should be addressed in a separate PR. (And since it's functionality for saving and loading JSON files, we need to consider loading as well (such as adding legacy compatibility logic, etc.))

}

# Get constraint values if they exist
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