Apache Tika File Similarity based on Jaccard distance, Edit distance & Cosine distance

This project demonstrates using the Tika-Python package (Python port of Apache Tika) to compute file similarity based on Metadata features.

The script can iterate over all files in the current directory or given files by command line and derives their metadata features, then computes the union of all features. The union of all features become the "golden feature set" that all document features are compared to via intersect. The length of that intersect per file divided by the length of the unioned set becomes the similarity score.

Scores are sorted in reverse (descending) order which can be shown in three different Data-Driven document visualizaions.

Pre-requisite

0. Install Tika-Python

Installation

pip install editdistance
git clone https://github.com/chrismattmann/tika-img-similarity

You can also check out ETLlib

How to use

Optional: Compute similarity only on specific IANA MIME Type(s) inside a directory using --accept

Key-based comparison

This compares metadata feature names as a golden feature set

#!/usr/bin/env python2.7
python similarity.py -f [directory of files] [--accept [jpeg pdf etc...]]
or 
python similarity.py -c [file1 file2 file3 ...]

Value-based comparison

This compares metadata feature names together with its value as a golden feature set

#!/usr/bin/env python2.7
python value-similarity.py -f [directory of files] [--accept [jpeg pdf etc...]]
or 
python value-similarity.py -c [file1 file2 file3 ...]

Edit Distance comparison on Metadata Values

• This computes pairwise similarity scores based on Edit Distance Similarity.
• Similarity Score of 1 implies an identical pair of documents.

#!/usr/bin/env python2.7
python edit-value-similarity.py [-h] --inputDir INPUTDIR --outCSV OUTCSV [--accept [png pdf etc...]] [--allKeys]

--inputDir INPUTDIR  path to directory containing files

--outCSV OUTCSV      path to directory for storing the output CSV File, containing pair-wise Similarity Scores based on Edit distance

--accept [ACCEPT]    Optional: compute similarity only on specified IANA MIME Type(s)

--allKeys            Optional: compute edit distance across all metadata keys of 2 documents, else default to only intersection of metadata keys

Eg: python edit-value-similarity.py --inputDir /path/to/files --outCSV /path/to/output.csv --accept png pdf gif

Cosine Distance comparison on Metadata Values

• This computes pairwise similarity scores based on Cosine Distance Similarity.
• Similarity Score of 1 implies an identical pair of documents.

#!/usr/bin/env python2.7
python cosine_similarity.py [-h] --inputDir INPUTDIR --outCSV OUTCSV [--accept [png pdf etc...]]

--inputDir INPUTDIR  path to directory containing files

--outCSV OUTCSV      path to directory for storing the output CSV File, containing pair-wise Similarity Scores based on Cosine distance

--accept [ACCEPT]    Optional: compute similarity only on specified IANA MIME Type(s)

D3 visualization

cluster viz

* python cluster-scores.py [-t threshold_value] (for generating cluster viz)
* open cluster-d3.html(or dynamic-cluster.html for interactive viz) in your browser

Default threshold value is 0.01.

###circlepacking viz

• Jaccard Similarity

* python circle-packing.py (for generating circlepacking viz)
* open circlepacking.html(or dynamic-circlepacking.html for interactive viz) in your browser

• Edit Distance & Cosine Similarity

* python edit-cosine-circle-packing.py <PATH TO CSV FILE> (for generating circlepacking viz)

<PATH TO CSV FILE> - Path to CSV file generated by running edit-value-similarity.py or cosine_similarity.py

* open circlepacking.html(or dynamic-circlepacking.html for interactive viz) in your browser

###composite viz This is a combination of cluster viz and circle packing viz. The deeper color, the more the same attributes in the cluster.

* open compositeViz.html in your browser

###Big data way if you are dealing with big data, you can use it this way:

* python generateLevelCluster.py (for generating level cluster viz)
* open levelCluster-d3.html in your browser

You can set max number for each node _maxNumNode(default _maxNumNode = 10) in generateLevelCluster.py

Questions, comments?

Send them to Chris A. Mattmann.

Contributors

• Chris A. Mattmann, JPL
• Dongni Zhao, USC
• Harshavardhan Manjunatha, USC
• Thamme Gowda, USC
• Ayberk Yılmaz, USC

License

This project is licensed under the Apache License, version 2.0.