Codegen is a model for conversational program synthesis, where each problem is interactively solved in multiple steps, each consisting of a natural language specification from the user and a synthesized subprogram from the system. 

It was was sequentially trained on three datasets:
- The Pile 
- A 341GB subset of Google’s [BigQuery dataset](https://cloud.google.com/blog/topics/public-datasets/github-on-bigquery-analyze-all-the-open-source-code) of code files from multiple programming languages, keeping only 6: C, C++, Go, Java, JavaScript, and Python 
- 217GB of Python data from Github repositories 

The second and third datasets used the following preprocessing:
- Exact match deduplication 
- Filtering:
    - Exact match deduplication 
    - Average line length < 100 tokens
    - Maximum line length < 1000 MB
    - >90% of the characters being decimal or hexadecimal digits
    
**Remark**:
The reported data sizes are after preprocessing.