Created
December 2, 2018 08:53
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出現回数の少ないカテゴリに関しては、TargetEncodingの信頼性が少なくなる。ので、そうなるようにそのカテゴリの出現回数(view_cat)をlog(n), 例えばn=100000で割ることで、その信頼度を割り引いてやる。nは任意。https://www.kaggle.com/nanomathias/feature-engineering-importance-testing
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for cols in ATTRIBUTION_CATEGORIES: | |
# Aggregation function | |
def rate_calculation(x): | |
"""Calculate the attributed rate. Scale by confidence""" | |
rate = x.sum() / float(x.count()) | |
conf = np.min([1, np.log(x.count()) / log_group]) | |
return rate * conf | |
# Perform the merge | |
X_train = X_train.merge( | |
group_object['is_attributed']. \ | |
apply(rate_calculation). \ | |
reset_index(). \ | |
rename( | |
index=str, | |
columns={'is_attributed': new_feature} | |
)[cols + [new_feature]], | |
on=cols, how='left' | |
) |
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