bbe8054910
Move cleaning transformers into classifiers/cleaning.py (dropping the separate cleaning package) and implement them as plain classes rather than BaseEstimator/TransformerMixin subclasses, since Pipeline only needs fit/transform via duck typing. Also rename feature_classifier.py and bag_of_words.py to features.py and bow.py for brevity. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
90 lines
2.2 KiB
Python
90 lines
2.2 KiB
Python
"""Evaluate a spam classifier.
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Usage:
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spam -e
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spam classifiers.manual.ManualClassifier
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spam classifiers.features.FeatureClassifier
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spam classifiers.manual.ManualClassifier -t 0.2
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spam classifiers.manual.ManualClassifier -a
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spam classifiers.manual.ManualClassifier -a 5
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"""
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import argparse
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import importlib
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from sklearn.model_selection import train_test_split
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import cli.output as out
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from cli.data import load_spam
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def load_classifier(class_path):
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module_path, class_name = class_path.rsplit(".", 1)
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module = importlib.import_module(module_path)
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return getattr(module, class_name)()
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def main():
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parser = argparse.ArgumentParser(
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description="Train and evaluate a spam classifier."
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)
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parser.add_argument(
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"classifier",
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nargs="?",
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help="Fully-qualified class, e.g. classifiers.manual.ManualClassifier",
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)
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parser.add_argument(
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"-e", "--explore",
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action="store_true",
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help="Drop into an interactive shell with the dataset loaded as `df`",
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)
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parser.add_argument(
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"-t", "--test-ratio",
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type=float,
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default=0.3,
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help="Fraction held out for testing (default: 0.3)",
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)
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parser.add_argument(
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"-a", "--error-analysis",
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type=int,
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nargs="?",
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const=10,
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default=None,
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metavar="N",
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help="Show up to N misclassified examples (default: 10)",
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)
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args = parser.parse_args()
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if not args.classifier and not args.explore:
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parser.print_help()
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return
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df = load_spam()
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if args.explore:
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out.explore(df)
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if not args.classifier:
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return
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X = df["message"].values
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y = df["label"].values
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X_train, X_test, y_train, y_test = train_test_split(
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X, y, test_size=args.test_ratio, random_state=42
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)
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out.dataset_summary(df, len(X_train), len(X_test))
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clf = load_classifier(args.classifier)
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clf.fit(X_train, y_train)
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y_pred = clf.predict(X_test)
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out.evaluation(y_test, y_pred, type(clf).__name__)
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out.feature_weights(clf)
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if args.error_analysis is not None:
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out.error_analysis(X_test, y_test, y_pred, args.error_analysis)
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if __name__ == "__main__":
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main()
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