nevergrad import fails when profiler is active

[stephanos-stephani]

To reproduce:

from pyinstrument import Profiler

profiler = Profiler()
profiler.start()

import nevergrad as ng

profiler.stop()
profiler.print()

This is under python 3.11, nevergrad 0.13.0, and pyinstrument 4.6.1

Traceback:

---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
Cell In[1], line 6
      3 profiler = Profiler()
      4 profiler.start()
----> 6 import nevergrad as ng
      8 profiler.stop()
     10 profiler.print()

File ~/micromamba/envs/dev/lib/python3.11/site-packages/nevergrad/__init__.py:8
      6 from .common import typing as typing
      7 from .parametrization import parameter as p
----> 8 from .optimization import optimizerlib as optimizers  # busy namespace, likely to be simplified
      9 from .optimization import families as families
     10 from .optimization import callbacks as callbacks

File ~/micromamba/envs/dev/lib/python3.11/site-packages/nevergrad/optimization/__init__.py:7
      1 # Copyright (c) Meta Platforms, Inc. and affiliates.
      2 #
      3 # This source code is licensed under the MIT license found in the
      4 # LICENSE file in the root directory of this source tree.
      6 from .base import Optimizer  # abstract class, for type checking
----> 7 from . import optimizerlib
      8 from .optimizerlib import registry as registry

File ~/micromamba/envs/dev/lib/python3.11/site-packages/nevergrad/optimization/optimizerlib.py:26
     24 from nevergrad.parametrization import _layering
     25 from nevergrad.parametrization import _datalayers
---> 26 from . import oneshot
     27 from . import base
     28 from . import mutations

File ~/micromamba/envs/dev/lib/python3.11/site-packages/nevergrad/optimization/oneshot.py:461
    455 ScrHammersleySearch = SamplingSearch(sampler="Hammersley", scrambled=True).set_name(
    456     "ScrHammersleySearch", register=True
    457 )
    458 QOScrHammersleySearch = SamplingSearch(
    459     sampler="Hammersley", scrambled=True, opposition_mode="quasi"
    460 ).set_name("QOScrHammersleySearch", register=True)
--> 461 OScrHammersleySearch = SamplingSearch(
    462     sampler="Hammersley", scrambled=True, opposition_mode="opposite"
    463 ).set_name("OScrHammersleySearch", register=True)
    464 CauchyScrHammersleySearch = SamplingSearch(cauchy=True, sampler="Hammersley", scrambled=True).set_name(
    465     "CauchyScrHammersleySearch", register=True
    466 )
    467 LHSSearch = SamplingSearch(sampler="LHS").set_name("LHSSearch", register=True)

File ~/micromamba/envs/dev/lib/python3.11/site-packages/nevergrad/optimization/oneshot.py:407, in SamplingSearch.__init__(self, sampler, scrambled, middle_point, opposition_mode, cauchy, autorescale, scale, rescaled, recommendation_rule)
    394 def __init__(
    395     self,
    396     *,
   (...)
    405     recommendation_rule: str = "pessimistic",
    406 ) -> None:
--> 407     super().__init__(_SamplingSearch, locals())

File ~/micromamba/envs/dev/lib/python3.11/site-packages/nevergrad/optimization/base.py:776, in ConfiguredOptimizer.__init__(self, OptimizerClass, config, as_config)
    774 self._as_config = as_config
    775 self._config = config  # keep all, to avoid weird behavior at mismatch between optim and configoptim
--> 776 diff = ngtools.different_from_defaults(instance=self, instance_dict=config, check_mismatches=True)
    777 params = ", ".join(f"{x}={y!r}" for x, y in sorted(diff.items()))
    778 self.name = f"{self.__class__.__name__}({params})"

File ~/micromamba/envs/dev/lib/python3.11/site-packages/nevergrad/common/tools.py:185, in different_from_defaults(instance, instance_dict, check_mismatches)
    183     miss = set(instance_dict.keys()) - set(defaults.keys())
    184     if add or miss:  # this is to help during development
--> 185         raise RuntimeError(
    186             f"Mismatch between attributes and arguments of {instance.__class__}:\n"
    187             f"- additional: {add}\n- missing: {miss}"
    188         )
    189 else:
    190     defaults = {x: y for x, y in defaults.items() if x in instance.__dict__}

RuntimeError: Mismatch between attributes and arguments of <class 'nevergrad.optimization.oneshot.SamplingSearch'>:
- additional: set()
- missing: {'__class__', 'self'}