.. _example_plot_digits_pipe.py: ========================================================= Pipelining: chaining a PCA and a logistic regression ========================================================= The PCA does an unsupervised dimensionality reduction, while the logistic regression does the prediction. We use a GridSearchCV to set the dimensionality of the PCA .. image:: images/plot_digits_pipe_001.png :align: center **Python source code:** :download:`plot_digits_pipe.py ` .. literalinclude:: plot_digits_pipe.py :lines: 15- **Total running time of the example:** 8.43 seconds ( 0 minutes 8.43 seconds)