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[Docs] Add description of select_columns to guide #6119

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Aug 16, 2023
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[Docs] Add description of select_columns to guide #6119

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22 changes: 22 additions & 0 deletions docs/source/process.mdx
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Expand Up @@ -195,6 +195,28 @@ Dataset({
})
```

Conversely, [`~Dataset.select_columns`] selects one or more columns to keep and removes the rest. This function takes either one or a list of column names:

```py
>>> dataset
Dataset({
features: ['sentence1', 'sentence2', 'label', 'idx'],
num_rows: 3668
})
>>> dataset = dataset.select_columns(['sentence1', 'sentence2', 'idx'])
>>> dataset
Dataset({
features: ['sentence1', 'sentence2', 'idx'],
num_rows: 3668
})
>>> dataset = dataset.select_columns('idx')
>>> dataset
Dataset({
features: ['idx'],
num_rows: 3668
})
```

### Cast

The [`~Dataset.cast`] function transforms the feature type of one or more columns. This function accepts your new [`Features`] as its argument. The example below demonstrates how to change the [`ClassLabel`] and [`Value`] features:
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