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- from operator import itemgetter
- from itertools import islice
- # rango de las D columnas de Y más relevantes (mayor varianza)
- dia = enumerate(np.diag(Y))
- srt = sorted(dia, key=itemgetter(1), reverse=True)
- idx = islice(map(itemgetter(0), srt), D)
- rng = sorted(idx)
- # después
- Y[:,rng]
- V[:,rng]
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