danfo.OneHotEncoder
Encode categorical features as a one-hot numeric array.
class danfo.OneHotEncoder
danfo.js provides the OneHotEncoder class for encoding values in Series and Arrays to one-hot numeric arrays. This is mostly used as a preprocessing step before most machine learning tasks.
Examples
Convert Series to Dummy codes
Node
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const dfd = require("danfojs-node")
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let data = {
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fruits: ['pear', 'mango', "pawpaw", "mango", "bean"],
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Count: [20, 30, 89, 12, 30],
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Country: ["NG", "NG", "GH", "RU", "RU"]
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}
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let df = new dfd.DataFrame(data)
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let encode = new dfd.OneHotEncoder()
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encode.fit(df['fruits'])
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console.log(encode);
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let sf_enc = encode.transform(df['fruits'].values)
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console.log(sf_enc)
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let new_sf = encode.transform(["mango", "bean"])
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console.log(new_sf)
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Output
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OneHotEncoder { '$labels': [ 'pear', 'mango', 'pawpaw', 'bean' ] }
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[
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[ 1, 0, 0, 0 ],
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[ 0, 1, 0, 0 ],
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[ 0, 0, 1, 0 ],
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[ 0, 1, 0, 0 ],
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[ 0, 0, 0, 1 ]
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]
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[ [ 0, 1, 0, 0 ], [ 0, 0, 0, 1 ] ]
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Labels not found in the original data used for fitting are represented with 0s all through
Last modified 13d ago
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