danfo.LabelEncoder
Encode target labels with value between 0 and n_classes-1.
class danfo.LabelEncoder [source]
danfo.js provides the LabelEncoder class for encoding Series and Arrays to integer between 0 and n_classes -1. This is mostly used as a preprocessing step before most machine learning tasks.
The API is similar to sklearn's LabelEncoder, and provides a fit and transform method.
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let data = ["dog","cat","man","dog","cat","man","man","cat"]let series = new dfd.Series(data)let encode = new dfd.LabelEncoder()encode.fit(series)console.log(encode);let sf_enc = encode.transform(series.values)sf_enc.print()let new_sf = encode.transform(["dog","man"])new_sf.print()
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LabelEncoder { label: [ 'dog', 'cat', 'man' ] }╔═══╤══════════════════════╗║ │ 0 ║╟───┼──────────────────────╢║ 0 │ 0 ║╟───┼──────────────────────╢║ 1 │ 1 ║╟───┼──────────────────────╢║ 2 │ 2 ║╟───┼──────────────────────╢║ 3 │ 0 ║╟───┼──────────────────────╢║ 4 │ 1 ║╟───┼──────────────────────╢║ 5 │ 2 ║╟───┼──────────────────────╢║ 6 │ 2 ║╟───┼──────────────────────╢║ 7 │ 1 ║╚═══╧══════════════════════╝╔═══╤══════════════════════╗║ │ 0 ║╟───┼──────────────────────╢║ 0 │ 0 ║╟───┼──────────────────────╢║ 1 │ 2 ║╚═══╧══════════════════════╝
Labels not found in the original data used for fitting are represented with -1
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const dfd = require("danfojs-node")let data = { fruits: ['pear', 'mango', "pawpaw", "mango", "bean"] ,Count: [20, 30, 89, 12, 30],Country: ["NG", "NG", "GH", "RU", "RU"]}let df = new dfd.DataFrame(data)let encode = new dfd.LabelEncoder()encode.fit(df['fruits'])console.log(encode);let sf_enc = encode.transform(df['fruits'].values)sf_enc.print()let new_sf = encode.transform(["mango","man"])new_sf.print()
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LabelEncoder { label: [ 'pear', 'mango', 'pawpaw', 'bean' ] }╔═══╤══════════════════════╗║ │ 0 ║╟───┼──────────────────────╢║ 0 │ 0 ║╟───┼──────────────────────╢║ 1 │ 1 ║╟───┼──────────────────────╢║ 2 │ 2 ║╟───┼──────────────────────╢║ 3 │ 1 ║╟───┼──────────────────────╢║ 4 │ 3 ║╚═══╧══════════════════════╝╔═══╤══════════════════════╗║ │ 0 ║╟───┼──────────────────────╢║ 0 │ 1 ║╟───┼──────────────────────╢║ 1 │ -1 ║╚═══╧══════════════════════╝
See also OneHotEncoder and danfo.get_dummies
Last updated 10 months ago