File size: 56,125 Bytes
7885a28 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 |
"""
Metadata Routing Utility
In order to better understand the components implemented in this file, one
needs to understand their relationship to one another.
The only relevant public API for end users are the ``set_{method}_request`` methods,
e.g. ``estimator.set_fit_request(sample_weight=True)``. However, third-party
developers and users who implement custom meta-estimators, need to deal with
the objects implemented in this file.
All estimators (should) implement a ``get_metadata_routing`` method, returning
the routing requests set for the estimator. This method is automatically
implemented via ``BaseEstimator`` for all simple estimators, but needs a custom
implementation for meta-estimators.
In non-routing consumers, i.e. the simplest case, e.g. ``SVM``,
``get_metadata_routing`` returns a ``MetadataRequest`` object.
In routers, e.g. meta-estimators and a multi metric scorer,
``get_metadata_routing`` returns a ``MetadataRouter`` object.
An object which is both a router and a consumer, e.g. a meta-estimator which
consumes ``sample_weight`` and routes ``sample_weight`` to its sub-estimators,
routing information includes both information about the object itself (added
via ``MetadataRouter.add_self_request``), as well as the routing information
for its sub-estimators.
A ``MetadataRequest`` instance includes one ``MethodMetadataRequest`` per
method in ``METHODS``, which includes ``fit``, ``score``, etc.
Request values are added to the routing mechanism by adding them to
``MethodMetadataRequest`` instances, e.g.
``metadatarequest.fit.add(param="sample_weight", alias="my_weights")``. This is
used in ``set_{method}_request`` which are automatically generated, so users
and developers almost never need to directly call methods on a
``MethodMetadataRequest``.
The ``alias`` above in the ``add`` method has to be either a string (an alias),
or a {True (requested), False (unrequested), None (error if passed)}``. There
are some other special values such as ``UNUSED`` and ``WARN`` which are used
for purposes such as warning of removing a metadata in a child class, but not
used by the end users.
``MetadataRouter`` includes information about sub-objects' routing and how
methods are mapped together. For instance, the information about which methods
of a sub-estimator are called in which methods of the meta-estimator are all
stored here. Conceptually, this information looks like:
```
{
"sub_estimator1": (
mapping=[(caller="fit", callee="transform"), ...],
router=MetadataRequest(...), # or another MetadataRouter
),
...
}
```
To give the above representation some structure, we use the following objects:
- ``(caller=..., callee=...)`` is a namedtuple called ``MethodPair``
- The list of ``MethodPair`` stored in the ``mapping`` field of a `RouterMappingPair` is
a ``MethodMapping`` object
- ``(mapping=..., router=...)`` is a namedtuple called ``RouterMappingPair``
The ``set_{method}_request`` methods are dynamically generated for estimators
which inherit from the ``BaseEstimator``. This is done by attaching instances
of the ``RequestMethod`` descriptor to classes, which is done in the
``_MetadataRequester`` class, and ``BaseEstimator`` inherits from this mixin.
This mixin also implements the ``get_metadata_routing``, which meta-estimators
need to override, but it works for simple consumers as is.
"""
# Authors: The scikit-learn developers
# SPDX-License-Identifier: BSD-3-Clause
import inspect
from collections import namedtuple
from copy import deepcopy
from typing import TYPE_CHECKING, Optional, Union
from warnings import warn
from .. import get_config
from ..exceptions import UnsetMetadataPassedError
from ._bunch import Bunch
# Only the following methods are supported in the routing mechanism. Adding new
# methods at the moment involves monkeypatching this list.
# Note that if this list is changed or monkeypatched, the corresponding method
# needs to be added under a TYPE_CHECKING condition like the one done here in
# _MetadataRequester
SIMPLE_METHODS = [
"fit",
"partial_fit",
"predict",
"predict_proba",
"predict_log_proba",
"decision_function",
"score",
"split",
"transform",
"inverse_transform",
]
# These methods are a composite of other methods and one cannot set their
# requests directly. Instead they should be set by setting the requests of the
# simple methods which make the composite ones.
COMPOSITE_METHODS = {
"fit_transform": ["fit", "transform"],
"fit_predict": ["fit", "predict"],
}
METHODS = SIMPLE_METHODS + list(COMPOSITE_METHODS.keys())
def _routing_enabled():
"""Return whether metadata routing is enabled.
.. versionadded:: 1.3
Returns
-------
enabled : bool
Whether metadata routing is enabled. If the config is not set, it
defaults to False.
"""
return get_config().get("enable_metadata_routing", False)
def _raise_for_params(params, owner, method):
"""Raise an error if metadata routing is not enabled and params are passed.
.. versionadded:: 1.4
Parameters
----------
params : dict
The metadata passed to a method.
owner : object
The object to which the method belongs.
method : str
The name of the method, e.g. "fit".
Raises
------
ValueError
If metadata routing is not enabled and params are passed.
"""
caller = (
f"{owner.__class__.__name__}.{method}" if method else owner.__class__.__name__
)
if not _routing_enabled() and params:
raise ValueError(
f"Passing extra keyword arguments to {caller} is only supported if"
" enable_metadata_routing=True, which you can set using"
" `sklearn.set_config`. See the User Guide"
" <https://scikit-learn.org/stable/metadata_routing.html> for more"
f" details. Extra parameters passed are: {set(params)}"
)
def _raise_for_unsupported_routing(obj, method, **kwargs):
"""Raise when metadata routing is enabled and metadata is passed.
This is used in meta-estimators which have not implemented metadata routing
to prevent silent bugs. There is no need to use this function if the
meta-estimator is not accepting any metadata, especially in `fit`, since
if a meta-estimator accepts any metadata, they would do that in `fit` as
well.
Parameters
----------
obj : estimator
The estimator for which we're raising the error.
method : str
The method where the error is raised.
**kwargs : dict
The metadata passed to the method.
"""
kwargs = {key: value for key, value in kwargs.items() if value is not None}
if _routing_enabled() and kwargs:
cls_name = obj.__class__.__name__
raise NotImplementedError(
f"{cls_name}.{method} cannot accept given metadata ({set(kwargs.keys())})"
f" since metadata routing is not yet implemented for {cls_name}."
)
class _RoutingNotSupportedMixin:
"""A mixin to be used to remove the default `get_metadata_routing`.
This is used in meta-estimators where metadata routing is not yet
implemented.
This also makes it clear in our rendered documentation that this method
cannot be used.
"""
def get_metadata_routing(self):
"""Raise `NotImplementedError`.
This estimator does not support metadata routing yet."""
raise NotImplementedError(
f"{self.__class__.__name__} has not implemented metadata routing yet."
)
# Request values
# ==============
# Each request value needs to be one of the following values, or an alias.
# this is used in `__metadata_request__*` attributes to indicate that a
# metadata is not present even though it may be present in the
# corresponding method's signature.
UNUSED = "$UNUSED$"
# this is used whenever a default value is changed, and therefore the user
# should explicitly set the value, otherwise a warning is shown. An example
# is when a meta-estimator is only a router, but then becomes also a
# consumer in a new release.
WARN = "$WARN$"
# this is the default used in `set_{method}_request` methods to indicate no
# change requested by the user.
UNCHANGED = "$UNCHANGED$"
VALID_REQUEST_VALUES = [False, True, None, UNUSED, WARN]
def request_is_alias(item):
"""Check if an item is a valid alias.
Values in ``VALID_REQUEST_VALUES`` are not considered aliases in this
context. Only a string which is a valid identifier is.
Parameters
----------
item : object
The given item to be checked if it can be an alias.
Returns
-------
result : bool
Whether the given item is a valid alias.
"""
if item in VALID_REQUEST_VALUES:
return False
# item is only an alias if it's a valid identifier
return isinstance(item, str) and item.isidentifier()
def request_is_valid(item):
"""Check if an item is a valid request value (and not an alias).
Parameters
----------
item : object
The given item to be checked.
Returns
-------
result : bool
Whether the given item is valid.
"""
return item in VALID_REQUEST_VALUES
# Metadata Request for Simple Consumers
# =====================================
# This section includes MethodMetadataRequest and MetadataRequest which are
# used in simple consumers.
class MethodMetadataRequest:
"""A prescription of how metadata is to be passed to a single method.
Refer to :class:`MetadataRequest` for how this class is used.
.. versionadded:: 1.3
Parameters
----------
owner : str
A display name for the object owning these requests.
method : str
The name of the method to which these requests belong.
requests : dict of {str: bool, None or str}, default=None
The initial requests for this method.
"""
def __init__(self, owner, method, requests=None):
self._requests = requests or dict()
self.owner = owner
self.method = method
@property
def requests(self):
"""Dictionary of the form: ``{key: alias}``."""
return self._requests
def add_request(
self,
*,
param,
alias,
):
"""Add request info for a metadata.
Parameters
----------
param : str
The property for which a request is set.
alias : str, or {True, False, None}
Specifies which metadata should be routed to `param`
- str: the name (or alias) of metadata given to a meta-estimator that
should be routed to this parameter.
- True: requested
- False: not requested
- None: error if passed
"""
if not request_is_alias(alias) and not request_is_valid(alias):
raise ValueError(
f"The alias you're setting for `{param}` should be either a "
"valid identifier or one of {None, True, False}, but given "
f"value is: `{alias}`"
)
if alias == param:
alias = True
if alias == UNUSED:
if param in self._requests:
del self._requests[param]
else:
raise ValueError(
f"Trying to remove parameter {param} with UNUSED which doesn't"
" exist."
)
else:
self._requests[param] = alias
return self
def _get_param_names(self, return_alias):
"""Get names of all metadata that can be consumed or routed by this method.
This method returns the names of all metadata, even the ``False``
ones.
Parameters
----------
return_alias : bool
Controls whether original or aliased names should be returned. If
``False``, aliases are ignored and original names are returned.
Returns
-------
names : set of str
A set of strings with the names of all parameters.
"""
return set(
alias if return_alias and not request_is_valid(alias) else prop
for prop, alias in self._requests.items()
if not request_is_valid(alias) or alias is not False
)
def _check_warnings(self, *, params):
"""Check whether metadata is passed which is marked as WARN.
If any metadata is passed which is marked as WARN, a warning is raised.
Parameters
----------
params : dict
The metadata passed to a method.
"""
params = {} if params is None else params
warn_params = {
prop
for prop, alias in self._requests.items()
if alias == WARN and prop in params
}
for param in warn_params:
warn(
f"Support for {param} has recently been added to this class. "
"To maintain backward compatibility, it is ignored now. "
f"Using `set_{self.method}_request({param}={{True, False}})` "
"on this method of the class, you can set the request value "
"to False to silence this warning, or to True to consume and "
"use the metadata."
)
def _route_params(self, params, parent, caller):
"""Prepare the given parameters to be passed to the method.
The output of this method can be used directly as the input to the
corresponding method as extra props.
Parameters
----------
params : dict
A dictionary of provided metadata.
parent : object
Parent class object, that routes the metadata.
caller : str
Method from the parent class object, where the metadata is routed from.
Returns
-------
params : Bunch
A :class:`~sklearn.utils.Bunch` of {prop: value} which can be given to the
corresponding method.
"""
self._check_warnings(params=params)
unrequested = dict()
args = {arg: value for arg, value in params.items() if value is not None}
res = Bunch()
for prop, alias in self._requests.items():
if alias is False or alias == WARN:
continue
elif alias is True and prop in args:
res[prop] = args[prop]
elif alias is None and prop in args:
unrequested[prop] = args[prop]
elif alias in args:
res[prop] = args[alias]
if unrequested:
if self.method in COMPOSITE_METHODS:
callee_methods = COMPOSITE_METHODS[self.method]
else:
callee_methods = [self.method]
set_requests_on = "".join(
[
f".set_{method}_request({{metadata}}=True/False)"
for method in callee_methods
]
)
message = (
f"[{', '.join([key for key in unrequested])}] are passed but are not"
" explicitly set as requested or not requested for"
f" {self.owner}.{self.method}, which is used within"
f" {parent}.{caller}. Call `{self.owner}"
+ set_requests_on
+ "` for each metadata you want to request/ignore."
)
raise UnsetMetadataPassedError(
message=message,
unrequested_params=unrequested,
routed_params=res,
)
return res
def _consumes(self, params):
"""Check whether the given parameters are consumed by this method.
Parameters
----------
params : iterable of str
An iterable of parameters to check.
Returns
-------
consumed : set of str
A set of parameters which are consumed by this method.
"""
params = set(params)
res = set()
for prop, alias in self._requests.items():
if alias is True and prop in params:
res.add(prop)
elif isinstance(alias, str) and alias in params:
res.add(alias)
return res
def _serialize(self):
"""Serialize the object.
Returns
-------
obj : dict
A serialized version of the instance in the form of a dictionary.
"""
return self._requests
def __repr__(self):
return str(self._serialize())
def __str__(self):
return str(repr(self))
class MetadataRequest:
"""Contains the metadata request info of a consumer.
Instances of `MethodMetadataRequest` are used in this class for each
available method under `metadatarequest.{method}`.
Consumer-only classes such as simple estimators return a serialized
version of this class as the output of `get_metadata_routing()`.
.. versionadded:: 1.3
Parameters
----------
owner : str
The name of the object to which these requests belong.
"""
# this is here for us to use this attribute's value instead of doing
# `isinstance` in our checks, so that we avoid issues when people vendor
# this file instead of using it directly from scikit-learn.
_type = "metadata_request"
def __init__(self, owner):
self.owner = owner
for method in SIMPLE_METHODS:
setattr(
self,
method,
MethodMetadataRequest(owner=owner, method=method),
)
def consumes(self, method, params):
"""Check whether the given parameters are consumed by the given method.
.. versionadded:: 1.4
Parameters
----------
method : str
The name of the method to check.
params : iterable of str
An iterable of parameters to check.
Returns
-------
consumed : set of str
A set of parameters which are consumed by the given method.
"""
return getattr(self, method)._consumes(params=params)
def __getattr__(self, name):
# Called when the default attribute access fails with an AttributeError
# (either __getattribute__() raises an AttributeError because name is
# not an instance attribute or an attribute in the class tree for self;
# or __get__() of a name property raises AttributeError). This method
# should either return the (computed) attribute value or raise an
# AttributeError exception.
# https://docs.python.org/3/reference/datamodel.html#object.__getattr__
if name not in COMPOSITE_METHODS:
raise AttributeError(
f"'{self.__class__.__name__}' object has no attribute '{name}'"
)
requests = {}
for method in COMPOSITE_METHODS[name]:
mmr = getattr(self, method)
existing = set(requests.keys())
upcoming = set(mmr.requests.keys())
common = existing & upcoming
conflicts = [key for key in common if requests[key] != mmr._requests[key]]
if conflicts:
raise ValueError(
f"Conflicting metadata requests for {', '.join(conflicts)} while"
f" composing the requests for {name}. Metadata with the same name"
f" for methods {', '.join(COMPOSITE_METHODS[name])} should have the"
" same request value."
)
requests.update(mmr._requests)
return MethodMetadataRequest(owner=self.owner, method=name, requests=requests)
def _get_param_names(self, method, return_alias, ignore_self_request=None):
"""Get names of all metadata that can be consumed or routed by specified \
method.
This method returns the names of all metadata, even the ``False``
ones.
Parameters
----------
method : str
The name of the method for which metadata names are requested.
return_alias : bool
Controls whether original or aliased names should be returned. If
``False``, aliases are ignored and original names are returned.
ignore_self_request : bool
Ignored. Present for API compatibility.
Returns
-------
names : set of str
A set of strings with the names of all parameters.
"""
return getattr(self, method)._get_param_names(return_alias=return_alias)
def _route_params(self, *, params, method, parent, caller):
"""Prepare the given parameters to be passed to the method.
The output of this method can be used directly as the input to the
corresponding method as extra keyword arguments to pass metadata.
Parameters
----------
params : dict
A dictionary of provided metadata.
method : str
The name of the method for which the parameters are requested and
routed.
parent : object
Parent class object, that routes the metadata.
caller : str
Method from the parent class object, where the metadata is routed from.
Returns
-------
params : Bunch
A :class:`~sklearn.utils.Bunch` of {prop: value} which can be given to the
corresponding method.
"""
return getattr(self, method)._route_params(
params=params, parent=parent, caller=caller
)
def _check_warnings(self, *, method, params):
"""Check whether metadata is passed which is marked as WARN.
If any metadata is passed which is marked as WARN, a warning is raised.
Parameters
----------
method : str
The name of the method for which the warnings should be checked.
params : dict
The metadata passed to a method.
"""
getattr(self, method)._check_warnings(params=params)
def _serialize(self):
"""Serialize the object.
Returns
-------
obj : dict
A serialized version of the instance in the form of a dictionary.
"""
output = dict()
for method in SIMPLE_METHODS:
mmr = getattr(self, method)
if len(mmr.requests):
output[method] = mmr._serialize()
return output
def __repr__(self):
return str(self._serialize())
def __str__(self):
return str(repr(self))
# Metadata Request for Routers
# ============================
# This section includes all objects required for MetadataRouter which is used
# in routers, returned by their ``get_metadata_routing``.
# `RouterMappingPair` is used to store a (mapping, router) tuple where `mapping` is a
# `MethodMapping` object and `router` is the output of `get_metadata_routing`.
# `MetadataRouter` stores a collection of `RouterMappingPair` objects in its
# `_route_mappings` attribute.
RouterMappingPair = namedtuple("RouterMappingPair", ["mapping", "router"])
# `MethodPair` is used to store a single method routing. `MethodMapping` stores a list
# of `MethodPair` objects in its `_routes` attribute.
MethodPair = namedtuple("MethodPair", ["caller", "callee"])
class MethodMapping:
"""Stores the mapping between caller and callee methods for a router.
This class is primarily used in a ``get_metadata_routing()`` of a router
object when defining the mapping between the router's methods and a sub-object (a
sub-estimator or a scorer).
Iterating through an instance of this class yields
``MethodPair(caller, callee)`` instances.
.. versionadded:: 1.3
"""
def __init__(self):
self._routes = []
def __iter__(self):
return iter(self._routes)
def add(self, *, caller, callee):
"""Add a method mapping.
Parameters
----------
caller : str
Parent estimator's method name in which the ``callee`` is called.
callee : str
Child object's method name. This method is called in ``caller``.
Returns
-------
self : MethodMapping
Returns self.
"""
if caller not in METHODS:
raise ValueError(
f"Given caller:{caller} is not a valid method. Valid methods are:"
f" {METHODS}"
)
if callee not in METHODS:
raise ValueError(
f"Given callee:{callee} is not a valid method. Valid methods are:"
f" {METHODS}"
)
self._routes.append(MethodPair(caller=caller, callee=callee))
return self
def _serialize(self):
"""Serialize the object.
Returns
-------
obj : list
A serialized version of the instance in the form of a list.
"""
result = list()
for route in self._routes:
result.append({"caller": route.caller, "callee": route.callee})
return result
def __repr__(self):
return str(self._serialize())
def __str__(self):
return str(repr(self))
class MetadataRouter:
"""Stores and handles metadata routing for a router object.
This class is used by router objects to store and handle metadata routing.
Routing information is stored as a dictionary of the form ``{"object_name":
RouteMappingPair(method_mapping, routing_info)}``, where ``method_mapping``
is an instance of :class:`~sklearn.utils.metadata_routing.MethodMapping` and
``routing_info`` is either a
:class:`~sklearn.utils.metadata_routing.MetadataRequest` or a
:class:`~sklearn.utils.metadata_routing.MetadataRouter` instance.
.. versionadded:: 1.3
Parameters
----------
owner : str
The name of the object to which these requests belong.
"""
# this is here for us to use this attribute's value instead of doing
# `isinstance`` in our checks, so that we avoid issues when people vendor
# this file instead of using it directly from scikit-learn.
_type = "metadata_router"
def __init__(self, owner):
self._route_mappings = dict()
# `_self_request` is used if the router is also a consumer.
# _self_request, (added using `add_self_request()`) is treated
# differently from the other objects which are stored in
# _route_mappings.
self._self_request = None
self.owner = owner
def add_self_request(self, obj):
"""Add `self` (as a consumer) to the routing.
This method is used if the router is also a consumer, and hence the
router itself needs to be included in the routing. The passed object
can be an estimator or a
:class:`~sklearn.utils.metadata_routing.MetadataRequest`.
A router should add itself using this method instead of `add` since it
should be treated differently than the other objects to which metadata
is routed by the router.
Parameters
----------
obj : object
This is typically the router instance, i.e. `self` in a
``get_metadata_routing()`` implementation. It can also be a
``MetadataRequest`` instance.
Returns
-------
self : MetadataRouter
Returns `self`.
"""
if getattr(obj, "_type", None) == "metadata_request":
self._self_request = deepcopy(obj)
elif hasattr(obj, "_get_metadata_request"):
self._self_request = deepcopy(obj._get_metadata_request())
else:
raise ValueError(
"Given `obj` is neither a `MetadataRequest` nor does it implement the"
" required API. Inheriting from `BaseEstimator` implements the required"
" API."
)
return self
def add(self, *, method_mapping, **objs):
"""Add named objects with their corresponding method mapping.
Parameters
----------
method_mapping : MethodMapping
The mapping between the child and the parent's methods.
**objs : dict
A dictionary of objects from which metadata is extracted by calling
:func:`~sklearn.utils.metadata_routing.get_routing_for_object` on them.
Returns
-------
self : MetadataRouter
Returns `self`.
"""
method_mapping = deepcopy(method_mapping)
for name, obj in objs.items():
self._route_mappings[name] = RouterMappingPair(
mapping=method_mapping, router=get_routing_for_object(obj)
)
return self
def consumes(self, method, params):
"""Check whether the given parameters are consumed by the given method.
.. versionadded:: 1.4
Parameters
----------
method : str
The name of the method to check.
params : iterable of str
An iterable of parameters to check.
Returns
-------
consumed : set of str
A set of parameters which are consumed by the given method.
"""
res = set()
if self._self_request:
res = res | self._self_request.consumes(method=method, params=params)
for _, route_mapping in self._route_mappings.items():
for caller, callee in route_mapping.mapping:
if caller == method:
res = res | route_mapping.router.consumes(
method=callee, params=params
)
return res
def _get_param_names(self, *, method, return_alias, ignore_self_request):
"""Get names of all metadata that can be consumed or routed by specified \
method.
This method returns the names of all metadata, even the ``False``
ones.
Parameters
----------
method : str
The name of the method for which metadata names are requested.
return_alias : bool
Controls whether original or aliased names should be returned,
which only applies to the stored `self`. If no `self` routing
object is stored, this parameter has no effect.
ignore_self_request : bool
If `self._self_request` should be ignored. This is used in `_route_params`.
If ``True``, ``return_alias`` has no effect.
Returns
-------
names : set of str
A set of strings with the names of all parameters.
"""
res = set()
if self._self_request and not ignore_self_request:
res = res.union(
self._self_request._get_param_names(
method=method, return_alias=return_alias
)
)
for name, route_mapping in self._route_mappings.items():
for caller, callee in route_mapping.mapping:
if caller == method:
res = res.union(
route_mapping.router._get_param_names(
method=callee, return_alias=True, ignore_self_request=False
)
)
return res
def _route_params(self, *, params, method, parent, caller):
"""Prepare the given parameters to be passed to the method.
This is used when a router is used as a child object of another router.
The parent router then passes all parameters understood by the child
object to it and delegates their validation to the child.
The output of this method can be used directly as the input to the
corresponding method as extra props.
Parameters
----------
params : dict
A dictionary of provided metadata.
method : str
The name of the method for which the parameters are requested and
routed.
parent : object
Parent class object, that routes the metadata.
caller : str
Method from the parent class object, where the metadata is routed from.
Returns
-------
params : Bunch
A :class:`~sklearn.utils.Bunch` of {prop: value} which can be given to the
corresponding method.
"""
res = Bunch()
if self._self_request:
res.update(
self._self_request._route_params(
params=params,
method=method,
parent=parent,
caller=caller,
)
)
param_names = self._get_param_names(
method=method, return_alias=True, ignore_self_request=True
)
child_params = {
key: value for key, value in params.items() if key in param_names
}
for key in set(res.keys()).intersection(child_params.keys()):
# conflicts are okay if the passed objects are the same, but it's
# an issue if they're different objects.
if child_params[key] is not res[key]:
raise ValueError(
f"In {self.owner}, there is a conflict on {key} between what is"
" requested for this estimator and what is requested by its"
" children. You can resolve this conflict by using an alias for"
" the child estimator(s) requested metadata."
)
res.update(child_params)
return res
def route_params(self, *, caller, params):
"""Return the input parameters requested by child objects.
The output of this method is a :class:`~sklearn.utils.Bunch`, which includes the
metadata for all methods of each child object that is used in the router's
`caller` method.
If the router is also a consumer, it also checks for warnings of
`self`'s/consumer's requested metadata.
Parameters
----------
caller : str
The name of the method for which the parameters are requested and
routed. If called inside the :term:`fit` method of a router, it
would be `"fit"`.
params : dict
A dictionary of provided metadata.
Returns
-------
params : Bunch
A :class:`~sklearn.utils.Bunch` of the form
``{"object_name": {"method_name": {params: value}}}`` which can be
used to pass the required metadata to corresponding methods or
corresponding child objects.
"""
if self._self_request:
self._self_request._check_warnings(params=params, method=caller)
res = Bunch()
for name, route_mapping in self._route_mappings.items():
router, mapping = route_mapping.router, route_mapping.mapping
res[name] = Bunch()
for _caller, _callee in mapping:
if _caller == caller:
res[name][_callee] = router._route_params(
params=params,
method=_callee,
parent=self.owner,
caller=caller,
)
return res
def validate_metadata(self, *, method, params):
"""Validate given metadata for a method.
This raises a ``TypeError`` if some of the passed metadata are not
understood by child objects.
Parameters
----------
method : str
The name of the method for which the parameters are requested and
routed. If called inside the :term:`fit` method of a router, it
would be `"fit"`.
params : dict
A dictionary of provided metadata.
"""
param_names = self._get_param_names(
method=method, return_alias=False, ignore_self_request=False
)
if self._self_request:
self_params = self._self_request._get_param_names(
method=method, return_alias=False
)
else:
self_params = set()
extra_keys = set(params.keys()) - param_names - self_params
if extra_keys:
raise TypeError(
f"{self.owner}.{method} got unexpected argument(s) {extra_keys}, which"
" are not routed to any object."
)
def _serialize(self):
"""Serialize the object.
Returns
-------
obj : dict
A serialized version of the instance in the form of a dictionary.
"""
res = dict()
if self._self_request:
res["$self_request"] = self._self_request._serialize()
for name, route_mapping in self._route_mappings.items():
res[name] = dict()
res[name]["mapping"] = route_mapping.mapping._serialize()
res[name]["router"] = route_mapping.router._serialize()
return res
def __iter__(self):
if self._self_request:
method_mapping = MethodMapping()
for method in METHODS:
method_mapping.add(caller=method, callee=method)
yield "$self_request", RouterMappingPair(
mapping=method_mapping, router=self._self_request
)
for name, route_mapping in self._route_mappings.items():
yield (name, route_mapping)
def __repr__(self):
return str(self._serialize())
def __str__(self):
return str(repr(self))
def get_routing_for_object(obj=None):
"""Get a ``Metadata{Router, Request}`` instance from the given object.
This function returns a
:class:`~sklearn.utils.metadata_routing.MetadataRouter` or a
:class:`~sklearn.utils.metadata_routing.MetadataRequest` from the given input.
This function always returns a copy or an instance constructed from the
input, such that changing the output of this function will not change the
original object.
.. versionadded:: 1.3
Parameters
----------
obj : object
- If the object provides a `get_metadata_routing` method, return a copy
of the output of that method.
- If the object is already a
:class:`~sklearn.utils.metadata_routing.MetadataRequest` or a
:class:`~sklearn.utils.metadata_routing.MetadataRouter`, return a copy
of that.
- Returns an empty :class:`~sklearn.utils.metadata_routing.MetadataRequest`
otherwise.
Returns
-------
obj : MetadataRequest or MetadataRouting
A ``MetadataRequest`` or a ``MetadataRouting`` taken or created from
the given object.
"""
# doing this instead of a try/except since an AttributeError could be raised
# for other reasons.
if hasattr(obj, "get_metadata_routing"):
return deepcopy(obj.get_metadata_routing())
elif getattr(obj, "_type", None) in ["metadata_request", "metadata_router"]:
return deepcopy(obj)
return MetadataRequest(owner=None)
# Request method
# ==============
# This section includes what's needed for the request method descriptor and
# their dynamic generation in a meta class.
# These strings are used to dynamically generate the docstrings for
# set_{method}_request methods.
REQUESTER_DOC = """ Request metadata passed to the ``{method}`` method.
Note that this method is only relevant if
``enable_metadata_routing=True`` (see :func:`sklearn.set_config`).
Please see :ref:`User Guide <metadata_routing>` on how the routing
mechanism works.
The options for each parameter are:
- ``True``: metadata is requested, and \
passed to ``{method}`` if provided. The request is ignored if \
metadata is not provided.
- ``False``: metadata is not requested and the meta-estimator \
will not pass it to ``{method}``.
- ``None``: metadata is not requested, and the meta-estimator \
will raise an error if the user provides it.
- ``str``: metadata should be passed to the meta-estimator with \
this given alias instead of the original name.
The default (``sklearn.utils.metadata_routing.UNCHANGED``) retains the
existing request. This allows you to change the request for some
parameters and not others.
.. versionadded:: 1.3
.. note::
This method is only relevant if this estimator is used as a
sub-estimator of a meta-estimator, e.g. used inside a
:class:`~sklearn.pipeline.Pipeline`. Otherwise it has no effect.
Parameters
----------
"""
REQUESTER_DOC_PARAM = """ {metadata} : str, True, False, or None, \
default=sklearn.utils.metadata_routing.UNCHANGED
Metadata routing for ``{metadata}`` parameter in ``{method}``.
"""
REQUESTER_DOC_RETURN = """ Returns
-------
self : object
The updated object.
"""
class RequestMethod:
"""
A descriptor for request methods.
.. versionadded:: 1.3
Parameters
----------
name : str
The name of the method for which the request function should be
created, e.g. ``"fit"`` would create a ``set_fit_request`` function.
keys : list of str
A list of strings which are accepted parameters by the created
function, e.g. ``["sample_weight"]`` if the corresponding method
accepts it as a metadata.
validate_keys : bool, default=True
Whether to check if the requested parameters fit the actual parameters
of the method.
Notes
-----
This class is a descriptor [1]_ and uses PEP-362 to set the signature of
the returned function [2]_.
References
----------
.. [1] https://docs.python.org/3/howto/descriptor.html
.. [2] https://www.python.org/dev/peps/pep-0362/
"""
def __init__(self, name, keys, validate_keys=True):
self.name = name
self.keys = keys
self.validate_keys = validate_keys
def __get__(self, instance, owner):
# we would want to have a method which accepts only the expected args
def func(*args, **kw):
"""Updates the request for provided parameters
This docstring is overwritten below.
See REQUESTER_DOC for expected functionality
"""
if not _routing_enabled():
raise RuntimeError(
"This method is only available when metadata routing is enabled."
" You can enable it using"
" sklearn.set_config(enable_metadata_routing=True)."
)
if self.validate_keys and (set(kw) - set(self.keys)):
raise TypeError(
f"Unexpected args: {set(kw) - set(self.keys)} in {self.name}. "
f"Accepted arguments are: {set(self.keys)}"
)
# This makes it possible to use the decorated method as an unbound method,
# for instance when monkeypatching.
# https://github.com/scikit-learn/scikit-learn/issues/28632
if instance is None:
_instance = args[0]
args = args[1:]
else:
_instance = instance
# Replicating python's behavior when positional args are given other than
# `self`, and `self` is only allowed if this method is unbound.
if args:
raise TypeError(
f"set_{self.name}_request() takes 0 positional argument but"
f" {len(args)} were given"
)
requests = _instance._get_metadata_request()
method_metadata_request = getattr(requests, self.name)
for prop, alias in kw.items():
if alias is not UNCHANGED:
method_metadata_request.add_request(param=prop, alias=alias)
_instance._metadata_request = requests
return _instance
# Now we set the relevant attributes of the function so that it seems
# like a normal method to the end user, with known expected arguments.
func.__name__ = f"set_{self.name}_request"
params = [
inspect.Parameter(
name="self",
kind=inspect.Parameter.POSITIONAL_OR_KEYWORD,
annotation=owner,
)
]
params.extend(
[
inspect.Parameter(
k,
inspect.Parameter.KEYWORD_ONLY,
default=UNCHANGED,
annotation=Optional[Union[bool, None, str]],
)
for k in self.keys
]
)
func.__signature__ = inspect.Signature(
params,
return_annotation=owner,
)
doc = REQUESTER_DOC.format(method=self.name)
for metadata in self.keys:
doc += REQUESTER_DOC_PARAM.format(metadata=metadata, method=self.name)
doc += REQUESTER_DOC_RETURN
func.__doc__ = doc
return func
class _MetadataRequester:
"""Mixin class for adding metadata request functionality.
``BaseEstimator`` inherits from this Mixin.
.. versionadded:: 1.3
"""
if TYPE_CHECKING: # pragma: no cover
# This code is never run in runtime, but it's here for type checking.
# Type checkers fail to understand that the `set_{method}_request`
# methods are dynamically generated, and they complain that they are
# not defined. We define them here to make type checkers happy.
# During type checking analyzers assume this to be True.
# The following list of defined methods mirrors the list of methods
# in SIMPLE_METHODS.
# fmt: off
def set_fit_request(self, **kwargs): pass
def set_partial_fit_request(self, **kwargs): pass
def set_predict_request(self, **kwargs): pass
def set_predict_proba_request(self, **kwargs): pass
def set_predict_log_proba_request(self, **kwargs): pass
def set_decision_function_request(self, **kwargs): pass
def set_score_request(self, **kwargs): pass
def set_split_request(self, **kwargs): pass
def set_transform_request(self, **kwargs): pass
def set_inverse_transform_request(self, **kwargs): pass
# fmt: on
def __init_subclass__(cls, **kwargs):
"""Set the ``set_{method}_request`` methods.
This uses PEP-487 [1]_ to set the ``set_{method}_request`` methods. It
looks for the information available in the set default values which are
set using ``__metadata_request__*`` class attributes, or inferred
from method signatures.
The ``__metadata_request__*`` class attributes are used when a method
does not explicitly accept a metadata through its arguments or if the
developer would like to specify a request value for those metadata
which are different from the default ``None``.
References
----------
.. [1] https://www.python.org/dev/peps/pep-0487
"""
try:
requests = cls._get_default_requests()
except Exception:
# if there are any issues in the default values, it will be raised
# when ``get_metadata_routing`` is called. Here we are going to
# ignore all the issues such as bad defaults etc.
super().__init_subclass__(**kwargs)
return
for method in SIMPLE_METHODS:
mmr = getattr(requests, method)
# set ``set_{method}_request``` methods
if not len(mmr.requests):
continue
setattr(
cls,
f"set_{method}_request",
RequestMethod(method, sorted(mmr.requests.keys())),
)
super().__init_subclass__(**kwargs)
@classmethod
def _build_request_for_signature(cls, router, method):
"""Build the `MethodMetadataRequest` for a method using its signature.
This method takes all arguments from the method signature and uses
``None`` as their default request value, except ``X``, ``y``, ``Y``,
``Xt``, ``yt``, ``*args``, and ``**kwargs``.
Parameters
----------
router : MetadataRequest
The parent object for the created `MethodMetadataRequest`.
method : str
The name of the method.
Returns
-------
method_request : MethodMetadataRequest
The prepared request using the method's signature.
"""
mmr = MethodMetadataRequest(owner=cls.__name__, method=method)
# Here we use `isfunction` instead of `ismethod` because calling `getattr`
# on a class instead of an instance returns an unbound function.
if not hasattr(cls, method) or not inspect.isfunction(getattr(cls, method)):
return mmr
# ignore the first parameter of the method, which is usually "self"
params = list(inspect.signature(getattr(cls, method)).parameters.items())[1:]
for pname, param in params:
if pname in {"X", "y", "Y", "Xt", "yt"}:
continue
if param.kind in {param.VAR_POSITIONAL, param.VAR_KEYWORD}:
continue
mmr.add_request(
param=pname,
alias=None,
)
return mmr
@classmethod
def _get_default_requests(cls):
"""Collect default request values.
This method combines the information present in ``__metadata_request__*``
class attributes, as well as determining request keys from method
signatures.
"""
requests = MetadataRequest(owner=cls.__name__)
for method in SIMPLE_METHODS:
setattr(
requests,
method,
cls._build_request_for_signature(router=requests, method=method),
)
# Then overwrite those defaults with the ones provided in
# __metadata_request__* attributes. Defaults set in
# __metadata_request__* attributes take precedence over signature
# sniffing.
# need to go through the MRO since this is a class attribute and
# ``vars`` doesn't report the parent class attributes. We go through
# the reverse of the MRO so that child classes have precedence over
# their parents.
substr = "__metadata_request__"
for base_class in reversed(inspect.getmro(cls)):
for attr, value in vars(base_class).items():
if substr not in attr:
continue
# we don't check for attr.startswith() since python prefixes attrs
# starting with __ with the `_ClassName`.
method = attr[attr.index(substr) + len(substr) :]
for prop, alias in value.items():
# Here we add request values specified via those class attributes
# to the `MetadataRequest` object. Adding a request which already
# exists will override the previous one. Since we go through the
# MRO in reverse order, the one specified by the lowest most classes
# in the inheritance tree are the ones which take effect.
getattr(requests, method).add_request(param=prop, alias=alias)
return requests
def _get_metadata_request(self):
"""Get requested data properties.
Please check :ref:`User Guide <metadata_routing>` on how the routing
mechanism works.
Returns
-------
request : MetadataRequest
A :class:`~sklearn.utils.metadata_routing.MetadataRequest` instance.
"""
if hasattr(self, "_metadata_request"):
requests = get_routing_for_object(self._metadata_request)
else:
requests = self._get_default_requests()
return requests
def get_metadata_routing(self):
"""Get metadata routing of this object.
Please check :ref:`User Guide <metadata_routing>` on how the routing
mechanism works.
Returns
-------
routing : MetadataRequest
A :class:`~sklearn.utils.metadata_routing.MetadataRequest` encapsulating
routing information.
"""
return self._get_metadata_request()
# Process Routing in Routers
# ==========================
# This is almost always the only method used in routers to process and route
# given metadata. This is to minimize the boilerplate required in routers.
# Here the first two arguments are positional only which makes everything
# passed as keyword argument a metadata. The first two args also have an `_`
# prefix to reduce the chances of name collisions with the passed metadata, and
# since they're positional only, users will never type those underscores.
def process_routing(_obj, _method, /, **kwargs):
"""Validate and route input parameters.
This function is used inside a router's method, e.g. :term:`fit`,
to validate the metadata and handle the routing.
Assuming this signature of a router's fit method:
``fit(self, X, y, sample_weight=None, **fit_params)``,
a call to this function would be:
``process_routing(self, "fit", sample_weight=sample_weight, **fit_params)``.
Note that if routing is not enabled and ``kwargs`` is empty, then it
returns an empty routing where ``process_routing(...).ANYTHING.ANY_METHOD``
is always an empty dictionary.
.. versionadded:: 1.3
Parameters
----------
_obj : object
An object implementing ``get_metadata_routing``. Typically a
meta-estimator.
_method : str
The name of the router's method in which this function is called.
**kwargs : dict
Metadata to be routed.
Returns
-------
routed_params : Bunch
A :class:`~utils.Bunch` of the form ``{"object_name": {"method_name":
{params: value}}}`` which can be used to pass the required metadata to
A :class:`~sklearn.utils.Bunch` of the form ``{"object_name": {"method_name":
{params: value}}}`` which can be used to pass the required metadata to
corresponding methods or corresponding child objects. The object names
are those defined in `obj.get_metadata_routing()`.
"""
if not kwargs:
# If routing is not enabled and kwargs are empty, then we don't have to
# try doing any routing, we can simply return a structure which returns
# an empty dict on routed_params.ANYTHING.ANY_METHOD.
class EmptyRequest:
def get(self, name, default=None):
return Bunch(**{method: dict() for method in METHODS})
def __getitem__(self, name):
return Bunch(**{method: dict() for method in METHODS})
def __getattr__(self, name):
return Bunch(**{method: dict() for method in METHODS})
return EmptyRequest()
if not (hasattr(_obj, "get_metadata_routing") or isinstance(_obj, MetadataRouter)):
raise AttributeError(
f"The given object ({repr(_obj.__class__.__name__)}) needs to either"
" implement the routing method `get_metadata_routing` or be a"
" `MetadataRouter` instance."
)
if _method not in METHODS:
raise TypeError(
f"Can only route and process input on these methods: {METHODS}, "
f"while the passed method is: {_method}."
)
request_routing = get_routing_for_object(_obj)
request_routing.validate_metadata(params=kwargs, method=_method)
routed_params = request_routing.route_params(params=kwargs, caller=_method)
return routed_params
|