Feature Hashing · Hivemall User Manual [PDF]

select feature_hashing(null,'-help'); usage: feature_hashing(array features [, const string options]) - re
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Hivemall supports Feature Hashing (a.k.a. hashing trick) through feature_hashing and mhash functions. Find the differences in the following examples.

Home

TABLE OF CONTENTS 1.1. Introduction 1.2. Getting Started

feature_hashing function feature_hashing applies MurmurHash3 hashing to features. select feature_hashing('aaa');

1.3. Tips for Effective Hivemall 1.4. General Hive/Hadoop tips 1.5. Troubleshooting PART II - GENERIC FEATURES

4063537 select feature_hashing('aaa','-features 3');

2

2.1. List of generic Hivemall functio… 2.2. Efficient Top-K query processi… 2.3. Text Tokenizer 2.4. Approximate Aggregate Funct…

select feature_hashing(array('aaa','bbb'));

["4063537","8459207"] select feature_hashing(array('aaa','bbb'),'-features 10');

PART III - FEATURE ENGINEERING 3.1. Feature Scaling 3.2. Feature Hashing 3.3. Feature Selection 3.4. Feature Binning

["7","1"] select feature_hashing(array('aaa:1.0','aaa','bbb:2.0'));

["4063537:1.0","4063537","8459207:2.0"]

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