# syed-muhammadtaha/gpt-2 architecture

> Architecture diagram of the GitHub repository syed-muhammadtaha/gpt-2, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-25). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/syed-muhammadtaha/gpt-2
- Repository: https://github.com/syed-muhammadtaha/gpt-2

## Overview

This repository contains a GPT-2-style language-model pretraining implementation: FineWeb-Edu text is tokenized into binary shards, batches are loaded, and a transformer is trained with checkpointing and W&B logging. The sampled source does not show inference or evaluation. There is an entrypoint mismatch: the configured `gpt-2` command calls `src/gpt_2/__init__.py`, which only prints a greeting; it does not launch `main.py`. The README is empty, so capabilities and wiring here are based on the sampled source.

Main entry points: [`src/gpt_2/main.py`](https://github.com/syed-muhammadtaha/gpt-2/blob/master/src/gpt_2/main.py) (Training loop), [`src/gpt_2/scripts/preproc_fineweb.py`](https://github.com/syed-muhammadtaha/gpt-2/blob/master/src/gpt_2/scripts/preproc_fineweb.py) (FineWeb preprocessor), [`src/gpt_2/loader.py`](https://github.com/syed-muhammadtaha/gpt-2/blob/master/src/gpt_2/loader.py) (Batch loader), [`src/gpt_2/model.py`](https://github.com/syed-muhammadtaha/gpt-2/blob/master/src/gpt_2/model.py) (GPT transformer)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_prep["Data preparation"]
  node_preprocessor["FineWeb preprocessor<br/>[preproc_fineweb.py]"]
end

subgraph group_train["Training runtime"]
  node_trainer["Training loop<br/>[main.py]"]
  node_loader["Batch loader<br/>[loader.py]"]
  node_checkpoint["Training checkpoint"]
end

subgraph group_modeling["Model"]
  node_gpt["GPT transformer<br/>[model.py]"]
end

node_user(("Command user"))
node_package_entry["Package entrypoint<br/>[__init__.py]"]
node_fineweb[("FineWeb-Edu")]
node_tokenizer["GPT-2 tokenizer"]
node_shards[("Token shards")]
node_wandb["W&amp;B tracking"]

node_user -->|"runs command"| node_package_entry
node_preprocessor -->|"loads dataset"| node_fineweb
node_preprocessor -->|"encodes text"| node_tokenizer
node_preprocessor -->|"writes tokens"| node_shards
node_loader -->|"reads batches"| node_shards
node_trainer -->|"requests batches"| node_loader
node_trainer -->|"computes logits"| node_gpt
node_trainer -->|"saves state"| node_checkpoint
node_checkpoint -->|"restores state"| node_trainer
node_trainer -->|"logs metrics"| node_wandb

click node_package_entry "https://github.com/syed-muhammadtaha/gpt-2/blob/master/src/gpt_2/__init__.py"
click node_preprocessor "https://github.com/syed-muhammadtaha/gpt-2/blob/master/src/gpt_2/scripts/preproc_fineweb.py"
click node_trainer "https://github.com/syed-muhammadtaha/gpt-2/blob/master/src/gpt_2/main.py"
click node_loader "https://github.com/syed-muhammadtaha/gpt-2/blob/master/src/gpt_2/loader.py"
click node_gpt "https://github.com/syed-muhammadtaha/gpt-2/blob/master/src/gpt_2/model.py"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_preprocessor,node_user toneBlue
class node_trainer,node_loader,node_checkpoint,node_fineweb,node_shards toneAmber
class node_gpt toneMint
class node_package_entry toneTeal
class node_tokenizer,node_wandb toneIndigo
```

## Components

### Data preparation

- [FineWeb preprocessor](https://github.com/syed-muhammadtaha/gpt-2/blob/master/src/gpt_2/scripts/preproc_fineweb.py): `src/gpt_2/scripts/preproc_fineweb.py`

### Training runtime

- [Training loop](https://github.com/syed-muhammadtaha/gpt-2/blob/master/src/gpt_2/main.py): `src/gpt_2/main.py`
- [Batch loader](https://github.com/syed-muhammadtaha/gpt-2/blob/master/src/gpt_2/loader.py): `src/gpt_2/loader.py`
- **Training checkpoint**

### Model

- [GPT transformer](https://github.com/syed-muhammadtaha/gpt-2/blob/master/src/gpt_2/model.py): `src/gpt_2/model.py`

### Other components

- **Command user**
- [Package entrypoint](https://github.com/syed-muhammadtaha/gpt-2/blob/master/src/gpt_2/__init__.py): `src/gpt_2/__init__.py`
- **FineWeb-Edu**
- **GPT-2 tokenizer**
- **Token shards**
- **W&B tracking**

## Connections

- Command user → Package entrypoint: runs command
- FineWeb preprocessor → FineWeb-Edu: loads dataset
- FineWeb preprocessor → GPT-2 tokenizer: encodes text
- FineWeb preprocessor → Token shards: writes tokens
- Batch loader → Token shards: reads batches
- Training loop → Batch loader: requests batches
- Training loop → GPT transformer: computes logits
- Training loop → Training checkpoint: saves state
- Training checkpoint → Training loop: restores state
- Training loop → W&B tracking: logs metrics