ValueError: Bad input shape for metric

ValueError: bad input shape for metric

$ python -c "from sklearn.metrics import precision_score; precision_score([[0],[1]], [[0],[1]])"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ValueError: Found input variables with inconsistent numbers of samples or shapes.

Why this happens

• Passing 2D arrays or mismatched shapes.

Fix

• Pass 1D arrays with same length.

Wrong code

precision_score([[0],[1]], [[0],[1]])

Fixed code

precision_score([0,1], [0,1])