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import numpy as np | |
class OneHotTransformer: | |
def __init__(self, func): | |
self.f = func | |
def fit(self, X, y=None): | |
unseen = object() | |
seen = set() | |
for x in X: | |
seen.add(self.f(x)) | |
self.seen = list(sorted(seen)) + [unseen] | |
return self | |
def transform(self, X): | |
return np.array([self.transform_one(x) for x in X]) | |
def transform_one(self, x): | |
result = [0] * len(self.seen) | |
value = self.f(x) | |
if value in self.seen: | |
result[self.seen.index(value)] = 1 | |
else: | |
result[-1] = 1 | |
return result |
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