VQCClassifier
=============

The ``VQCClassifier`` is a variational quantum classifier compatible with scikit-learn.

.. autoclass:: psipose.estimators.VQCClassifier
   :members:
   :undoc-members:
   :show-inheritance:
   :no-index:

Binary vs Multi-class
---------------------

For binary classification (2 classes), a single QNode measures Pauli-Z expectation.
For multi-class, one-vs-rest strategy trains one binary classifier per class.

Using with sklearn
------------------

.. code-block:: python

   from sklearn.pipeline import Pipeline
   from sklearn.preprocessing import StandardScaler
   from psipose.estimators import VQCClassifier

   pipe = Pipeline([
       ("scaler", StandardScaler()),
       ("vqc", VQCClassifier(n_qubits=4, n_iter=100))
   ])
   pipe.fit(X_train, y_train)