ImportError: cannot import name 'Pipeline' from sklearn.pipeline

ImportError: cannot import name ‘Pipeline’

$ python -c "from sklearn.pipeline import Pipeline"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ImportError: cannot import name 'Pipeline' from 'sklearn.pipeline'

Why this happens

• Old/broken scikit-learn installation.
• Shadowed by local sklearn files.

Fix

• Reinstall or upgrade scikit-learn.
• Ensure correct import path.

Wrong code

from sklearn.pipeline import Pipeline
pipe = Pipeline
pipe.fit(X, y)

Fixed code

from sklearn.pipeline import Pipeline
from sklearn.preprocessing import StandardScaler
from sklearn.linear_model import LogisticRegression

pipe = Pipeline([
    ("scaler", StandardScaler()),
    ("clf", LogisticRegression(max_iter=1000))
])
# X: 2D features, y: 1D labels
pipe.fit([[0,1],[1,0]], [0,1])
print(pipe.predict([[0.2, 0.8]]))