uk_address_matcher 1.0.0.dev4

A package for matching UK addresses using a pretrained Splink model

Matching UK addresses using Splink

Installation

At the moment this uses a branch of Splink only available on Github.

pip install --pre uk_address_matcher
pip install git+https://github.com/moj-analytical-services/splink.git@2580-improve-runtimes-but-pushing-up-common-case-statements-into-precomputed-values

Usage

High performance address matching using a pre-trained Splink model.

Assuming you have two duckdb dataframes in this format:

unique_id	address_concat	postcode
1	123 Fake Street, Faketown	FA1 2KE
2	456 Other Road, Otherville	NO1 3WY
...	...	...

Match them with:

import duckdb

from uk_address_matcher import clean_data_using_precomputed_rel_tok_freq, get_linker

p_ch = "./example_data/companies_house_addresess_postcode_overlap.parquet"
p_fhrs = "./example_data/fhrs_addresses_sample.parquet"

con = duckdb.connect(database=":memory:")

df_ch = con.read_parquet(p_ch).order("postcode")
df_fhrs = con.read_parquet(p_fhrs).order("postcode")

df_ch_clean = clean_data_using_precomputed_rel_tok_freq(df_ch, con=con)
df_fhrs_clean = clean_data_using_precomputed_rel_tok_freq(df_fhrs, con=con)

linker = get_linker(
    df_addresses_to_match=df_fhrs_clean,
    df_addresses_to_search_within=df_ch_clean,
    con=con,
    include_full_postcode_block=True,
    additional_columns_to_retain=["original_address_concat"],
)

df_predict = linker.inference.predict(
    threshold_match_weight=-50, experimental_optimisation=True
)
df_predict_ddb = df_predict.as_duckdbpyrelation()

Initial tests suggest you can match ~ 1,000 addresses per second against a list of 30 million addresses on a laptop.

Refer to the example, which has detailed comments, for how to match your data.

See an example of comparing two addresses to get a sense of what it does/how it scores

Run an interactive example in your browser:

Match 5,000 FHRS records to 21,952 companies house records in < 10 seconds.

Investigate and understand how the model works