sklearn计算idf值公式

最新推荐文章于 2024-11-12 17:34:13 发布

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最新推荐文章于 2024-11-12 17:34:13 发布

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        if self.use_idf:
            n_samples, n_features = X.shape
            df = _document_frequency(X)
            df = df.astype(dtype, **`_astype_copy_false`(df))

            # perform idf smoothing if required
            df += int(self.smooth_idf)
            n_samples += int(self.smooth_idf)

            # log+1 instead of log makes sure terms with zero idf don't get
            # suppressed entirely.
            idf = np.log(n_samples / df) + 1