code: def mock_no_sklearn():
      with patch.dict("sys.modules", {"sklearn.metrics": None}):
          yield sklearn
  
imports: import os
  from typing import Tuple
  from unittest.mock import patch
  import numpy
  import pytest
  import sklearn
  import torch
  from sklearn.metrics import precision_recall_curve
  import ignite.distributed
  from ignite.contrib.metrics.precision_recall_curve import PrecisionRecallCurve
  from ignite.engine import Engine
  from ignite.metrics.epoch_metric import EpochMetricWarning
label_desc: Use image node_id 1 for calling a global function with example usage: mock_no_sklearn() without return types