Rewrite examples/plot_forest_importance_faces.rb

Author: mrkn

examples/plot_forest_importances_faces.rb

@@ -17,8 +17,8 @@
 n_jobs = 1
 
 # Load the faces datasets
-data = fetch_olivetti_faces.()
-x = data.images.reshape.(PyCall.tuple(PyCall.len(data.images), -1))
+data = fetch_olivetti_faces()
+x = data.images.reshape([PyCall.len(data.images), -1])
 y = data.target
 
 mask = y < 5  # Limit to 5 classes
@@ -28,19 +28,19 @@
 # Build a forest and compute the pixel importances
 puts "Fitting ExtraTreesClassifier on faces data with #{n_jobs} cores..."
 t0 = Time.now
-forest = ExtraTreesClassifier.(
+forest = ExtraTreesClassifier.new(
   n_estimators: 1_000,
   max_features: 128,
   n_jobs: n_jobs,
   random_state: 0
 )
 
-forest = forest.fit.(x, y)
+forest = forest.fit(x, y)
 puts "done in %0.3fs" % (Time.now - t0)
 importances = forest.feature_importances_
-importances = importances.reshape.(data.images[0].shape)
+importances = importances.reshape(data.images[0].shape)
 
 # Plot pixel importances
-plt.matshow.(importances, cmap: plt.cm.hot)
-plt.title.("Pixel importances with forests of trees")
-plt.show.()
+plt.matshow(importances, cmap: plt.cm.__dict__[:hot])
+plt.title("Pixel importances with forests of trees")
+plt.show()