hashtrick: Hash Trick Functions for Model Building

In nfultz/hashtrick: Hash Trick

Description

hashtrick builds a matrix using the hash trick, hash_col hashes a single column.

Usage

hashtrick(..., m = 256L, algo = "md5", key = DEFAULT_KEY)

hash_col(x, m, algo, key)

## S3 method for class 'character'
hash_col(x, m, algo, key)

## S3 method for class 'numeric'
hash_col(x, m, algo, key)

## S3 method for class 'factor'
hash_col(x, m, algo, key)

Arguments

...	a list of variables
m	modulo - number of columns for result
algo	'md5' and others provided by OpenSSL
key	a list of raws. If provided, the hash function generates a different mapping
x	character vector to hash

Value

for hashtrick, a n-by-m matrix of the dummy coded features. For hash_col, a matrix containing hashes, one column per key provided.

nfultz/hashtrick documentation built on May 23, 2019, 4:41 p.m.