Add CLI option

cli/main.py

@@ -7,6 +7,7 @@ Usage:
     spam classifiers.manual.ManualClassifier -t 0.2
     spam classifiers.manual.ManualClassifier -a
     spam classifiers.manual.ManualClassifier -a 5
+    spam classifiers.manual.ManualClassifier -f 20
 """
 
 import argparse
@@ -53,6 +54,13 @@ def main():
         metavar="N",
         help="Show up to N misclassified examples (default: 10)",
     )
+    parser.add_argument(
+        "-f", "--top-features",
+        type=int,
+        default=10,
+        metavar="N",
+        help="Show the top N features by weight (default: 10)",
+    )
     args = parser.parse_args()
 
     if not args.classifier and not args.explore:
@@ -79,7 +87,7 @@ def main():
     y_pred = clf.predict(X_test)
 
     out.evaluation(y_test, y_pred, type(clf).__name__)
-    out.feature_weights(clf)
+    out.feature_weights(clf, top_n=args.top_features)
 
     if args.error_analysis is not None:
         out.error_analysis(X_test, y_test, y_pred, args.error_analysis)