Introduction

This is a fast trie structure, written with C++ and compiled to python using Cython.

Compared to the pytrie, which is based the python build-in type dict, our method achieves 3 time faster and about half memory usage.

We using the two method to exact all the 4gram features in ptb corpus, the results are shwon as follows:

result: (max_order=4, find_epoch=1)

model	create	search	write	memory usage
pytrie	9.0s	6s	21s	about 1B
trie	2.4s	2s	11s	about 500M

Install and compile the trie source codes:

First, you need the python with Cython.

Then to compile the C++ code, run:

python setup.py build_ext --inplace

Then run

python test.py

to evaulate the performance.