Code Walkthrough

Code Walkthrough

Pipeline

1. execute.py: Runs entire data processing pipeline and sets up client.
2. tokenize.py: Tokenize corpus
3. train_stmt/mallet.py: Train model
4. compute_saliency.py: Compute term saliency
5. compute_similarity.py: Compute term similarity
6. compute_seriation.py: Seriates terms
7. prepare_data_for_client.py: Generates datafiles for client
8. prepare_vis_for_client.py: Copies necessary scripts for client

--./execute.py --corpus-path <corpus_file> example_lda.cfg --model-path <any_path_for_model> --data-path <any_path_for_output>

Objective 1: Inspect the main() function to find out which flags are activated when running the file using above command line

The main function performs these steps:

Argument Parsing

• 1.1 parse all the arguments provided by user and ensures that a valid config file is being passed as an argument.

• 1.2 Reads in the default values from the config line

• 1.3 Checks if user has passed the optional arguments, if yes, it overrides the default values with these optional arguments values.

• 1.4 Triggers the execute function of Execute class using final arguments values.

Logging

• 1.5 execute function recheck the argument value to ensure these are NOT NONE and then enters these values along with current date and time in the logger info file.

Tokens

• 1.6 It then triggers the execute function of Tokenize class from tokenize.py file, followed by the input corpus_format, corpus_path, data_path, tokenization where this tokenization is the default tokenization from the config file. --I will look further into this

• 2.1 In case this tokenization is NONE, the execute functions set the tokenization value accordingly.

• 2.2 It then reads the source corpus and writes a list of tokens as output. A folder called tokens gets created which contains this list file as tokens.txt

STMT/Mallet

• 1.7 The execute.py function then checks model_library and verifies if it's stmt or mallet-- I am not sure about the difference between two, I will look further into their differences and significance

• 1.8 Depending on the value of model_library it runs the corresponding .sh file and passes the tokens.txt file.

• 3.1 The train_mallet.sh expects three arguments, input-file, output-path and num-topics

• 3.2 It then creates the output folder.

• 3.3 It then calls the mallet executable file which is inside the mallet-2.0.7/bin

• 3.4 The mallet model vectorize the token.txt file and store it in text.vector file

• 3.5 The train-topic function of the mallet executable file is called to train the topic model from the imported data files. Here text.vector file act as the input.

• 3.6 Below output files are created by the mallet model using Hierarchical LDA model

  • output.model
  • output-topic-keys.txt
  • topic-word-weights.txt
  • word-topic-counts.txt

• 1.9 The execute.py file then calls the import_mallet.execute function

• 3.7 The import_mallet.execute function reads the output of the mallet executable file and evokes the extractTopicWordWeights function

• 3.8 The extractTopicWordWeights function reads the content of files and gives us below matrix

  • term_tpoic_matrix
  • term_index
  • topic_index

• 3.9 Similarly, stmt also expects three arguments, input-file, output-path and num-topics

• 3.10 It loads lda-learn.scala file, this is the place where it connects with the lda algorithm and creates term-index, etc.

• 3.11 Creates and extracts below files

  • unpack topic-term-distribution.csv
  • Generate topic-index list
  • Copy term-index list
  • Extract doc-index list
  • Extract list of term frequencies

Compute Saliency

• 1.10 The execute.py runs ComputeSaliency.execute function and passes data path as an argument.

• 4.1 The data path should have term-topic probability distribution stored in 3 separate files:

  • 'term-topic-matrix.txt'- It contains the entries of the matrix.
  • 'term-index.txt'- It contains the terms corresponding to the rows of the matrix.
  • 'topic-index.txt' contains the topic labels corresponding to the columns of the matrix.

• 4.2 It then computes topic info, term info and rank the results.

• 4.3.1 It then writes the results into the disk

• 4.3.2 The output is a list of term distinctiveness and saliency values. The output is term info and topic info files in json and txt format.

Compute Similarity

• 1.11 The execute.py runs ComputeSimilarity.execute function and passes data path as an argument.

Compute Seriation

• 1.12 The execute.py runs ComputeSeriation.execute function and passes data path and number of seriated terms as arguments.

Prepare Data

• 1.13 The execute.py runs PrepareDataForClient.execute function and passes data path as an argument.

Prepare Visualization

• 1.14 The execute.py runs prepare_vis_for_client.sh which copies files necessary to run the client to the specified path’s public_html directory.

• 8.1 Prepare_vis_for_client.sh performs below actions:

  • Navigates to public_html library
  • Copy the js and css file to this folder

Output Folder Structure

The output folder structure, specified as a parameter when executing the code and on lines:

• LDA Output Folder - Chosen inside the main output folder
• Main output folder

Has the following format:

├── model
│   ├── term-index.txt
│   ├── term-topic-matrix.txt
│   └── topic-index.txt
├── saliency
│   ├── term-info.json
│   ├── term-info.txt
│   ├── topic-info.json
│   └── topic-info.txt
├── similarity
│   └── combined-g2.txt
├── tokens
│   └── tokens.txt
└── topic-model
    ├── output-topic-keys.txt
    ├── output.model
    ├── text.vectors
    ├── topic-word-weights.txt
    └── word-topic-counts.txt