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The Dedupe library made easy with Pandas.

Project description

pandas-dedupe

The Dedupe library made easy with Pandas.

Installation

pip install pandas-dedupe

Video Tutorials

Basic Deduplication

Basic Usage

Deduplication

import pandas as pd
import pandas_dedupe

#load dataframe
df = pd.read_csv('test_names.csv')

#initiate deduplication
df_final = pandas_dedupe.dedupe_dataframe(df,['first_name', 'last_name', 'middle_initial'])

#send output to csv
df_final.to_csv('deduplication_output.csv')


#------------------------------additional details------------------------------

#A training file and a settings file will be created while running Dedupe. 
#Keeping these files will eliminate the need to retrain your model in the future. 
#If you would like to retrain your model, just delete the settings and training files.

Matching / Record Linkage

import pandas as pd
import pandas_dedupe

#load dataframes
dfa = pd.read_csv('file_a.csv')
dfb = pd.read_csv('file_b.csv')

#initiate matching
df_final = pandas_dedupe.link_dataframes(dfa, dfb, ['field_1', 'field_2', 'field_3', 'field_4'])

#send output to csv
df_final.to_csv('linkage_output.csv')


#------------------------------additional details------------------------------

#Use identical field names when linking dataframes.

#Record linkage should only be used on dataframes that have been deduplicated.

#A training file and a settings file will be created while running Dedupe. 
#Keeping these files will eliminate the need to retrain your model in the future. 
#If you would like to retrain your model, just delete the settings and training files.

Advanced Usage

Set Confidence Threshold

pandas_dedupe.dedupe_dataframe(df,['first_name', 'last_name', 'middle_initial'], confidence_threshold=.3)

#------------------------------additional details------------------------------

#The default confidence_threshold is .2.

#The maximum value needed by at least one score in a cluster for the cluster to
#be recorded. For instance, with a cluster threshold of .3, the cluster below 
#would be kept:

#| name      | confidence | cluster id |
#|-----------|------------|------------|
#| John      | .7         | 0          |
#| Johnny    | .6         | 0          |
#| Johnathon | .4         | 0          |

#In the same case, the following cluster would not be recognized:

#| name      | confidence | cluster id |
#|-----------|------------|------------|
#| Ringo     | .2         |            |
#| Ronald    | .2         |            |

Specifying Types

# Price Example
pandas_dedupe.dedupe_dataframe(df,['first_name', 'last_name', ('salary', 'Price')])

# has missing Example
pandas_dedupe.link_dataframes(df,['SSN', ('bio_pgraph', 'Text'), ('salary', 'Price', 'has missing')])

# crf Example
pandas_dedupe.dedupe_dataframe(df,[('first_name', 'String', 'crf'), 'last_name', (m_initial, 'Exact')])


#------------------------------additional details------------------------------

#If a type is not explicity listed, String will be used.

#Tuple (parenthesis) is required to declare all other types. If you prefer use tuple
#for string also, ('first_name', 'String'), that's fine.

#If you want to specify either a 'crf' or 'has missing' parameter, a tuple with three elements
#must be used. ('first_name', 'String', 'crf') works, ('first_name', 'crf') does not work.

Types

Dedupe supports a variety of datatypes; a full listing with documentation can be found here.

pandas-dedupe officially supports the following datatypes:

  • String - Standard string comparison using string distance metric. This is the default type.
  • Text - Comparison for sentences or paragraphs of text. Uses cosine similarity metric.
  • Price - For comparing positive, non zero numerical values.
  • DateTime - For comparing dates.
  • LatLong - (39.990334, 70.012) will not match to (40.01, 69.98) using a string distance metric, even though the points are in a geographically similar location. The LatLong type resolves this by calculating the haversine distance between compared coordinates. LatLong requires the field to be in the format (Lat, Lng). The value can be a string, a tuple containing two strings, a tuple containing two floats, or a tuple containing two integers. If the format is not able to be processed, you will get a traceback.
  • Exact - Tests wheter fields are an exact match.
  • Exists - Sometimes, the presence or absence of data can be useful in predicting a match. The Exists type tests for whether both, one, or neither of fields are null.

Additional supported parameters are:

  • has missing - Can be used if one of your data fields contains null values
  • crf - Use conditional random fields for comparisons rather than distance metric. May be more accurate in some cases, but runs much slower. Works with String and ShortString types.

Credits

Many thanks to folks at DataMade for making the the Dedupe library publicly available. People interested in a code-free implementation of the dedupe library can find a link here: Dedupe.io.

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