CodeSnippetSearch

CodeSnippetSearch is a web application and a web extension that allows you to search GitHub repositories using natural language queries and code itself.

It is based on a neural bag of words code search implementation using PyTorch and data from the CodeSearchNet project. The model training code was heavily inspired by the baseline (Tensorflow) implementation in the CodeSearchNet repository. Currently, Python, Java, Go, Php, Javascript, and Ruby programming languages are supported.

Helpful papers:

• CodeSearchNet Challenge: Evaluating the State of Semantic Code Search
• When Deep Learning Met Code Search

Model description

Model structure

Project structure

• code_search: A Python package with scripts to prepare the data, train the language models and save the embeddings
• code_search_web: CodeSnippetSearch website Django project
• serialized_data: Store for intermediate objects during training (docs, vocabularies, models, embeddings etc.)
• codesearchnet_data: Data from the CodeSearchNet project

Data

We are using the data from the CodeSearchNet project. Run the following commands to download the required data:

• $ ./scripts/download_codesearchnet_data.sh

This will download around 20GB of data. Overview of the data structure is listed here.

Training the models

If you can, you should be performing these steps inside a virtual environment. To install the required dependencies run: $ ./scripts/install_pip_packages.sh. To install the code_search as a package run: $ ./scripts/install_code_search_package.sh

Preparing the data

Data preparation step is separate from the training step because it is time and memory consuming. We will prepare all the necessary data needed for training. This includes preprocessing code docs, building vocabularies, and encoding sequences.

The first step is to parse the CodeSearchNet data. We need to parse *_dedupe_definitions_v2.pkl files from a pickle format to jsonl format. We will be using the jsonl format throughout the project, since we can read the file line by line and keep the memory footprint minimal. Reading the evaluation docs requires more than 16GB of memory, because the entire file has to be read in memory (largest is javascript_dedupe_definitions_v2.pkl at 6.6GB). If you do not have this kind of horsepower, I suggest renting a cloud server with >16GB of memory and running this step on there. After you are done, just download the jsonl files to your local machine. Subsequent preparation and training steps should not take more than 16GB of memory.

To parse the CodeSearchNet data run: $ python parse_codesearchnet_data.py

To prepare the data for training run: $ python prepare_data.py --prepare-all. It uses the Python multiprocessing module to take advantage of multiple cores. If you encounter memory errors or slow performance you can tweak the number of processes by changing the parameter passed to multiprocessing.Pool.

Training and evaluation

You start the training by running: $ python train.py. This will train separate models for each language, build code embeddings and evaluate them according to MRR (Mean Reciprocal Rank) and output model_predictions.csv. These will be evaluated by Github & WANDB using NDCG (Normalized Discounted cumulative gain) metric to rank the submissions.

Query the trained models

Run $ python search.py "read file lines" and it will output 3 best ranked results for each language.