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https://github.com/clearhanhui/parquetloader
A Distributed Streaming PyTorch Dataloader for Parquet.
https://github.com/clearhanhui/parquetloader
distributed parquet pytorch
Last synced: 1 day ago
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A Distributed Streaming PyTorch Dataloader for Parquet.
- Host: GitHub
- URL: https://github.com/clearhanhui/parquetloader
- Owner: clearhanhui
- License: mit
- Created: 2024-07-22T18:42:40.000Z (4 months ago)
- Default Branch: main
- Last Pushed: 2024-08-01T15:55:42.000Z (4 months ago)
- Last Synced: 2024-08-02T14:43:53.576Z (4 months ago)
- Topics: distributed, parquet, pytorch
- Language: Python
- Homepage:
- Size: 78.8 MB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: readme.md
- License: LICENSE
Awesome Lists containing this project
README
# ParquetLoader
This project is inspired by [litdata](https://github.com/Lightning-AI/litdata).
It implements a PyTorch dataset and dataloader that support streaming and distributed loading of [Parquet](https://parquet.apache.org/docs/) datasets.
Key features:
* Streaming loading of large Parquet datasets, e.g., Hive tables stored in Parquet format.
* Near-zero redundancy loading across ranks & workers during distributed training.
* Asynchronous preloading to overlap training and loading for better efficiency.
Limitations:
* Less efficient than full memory loading for small datasets.
* Degrades to full loading (or worse) for datasets with only one or a few Parquet files/row groups.
* Row group size affects efficiency; it's recommended to set it to 1-1000 times the batch size.
## Installation
Install from source
``` shell
git clone https://github.com/clearhanhui/ParquetLoader.git
cd ParquetLoader
pip install .
```
## Usage
``` python
from parquet_loader import ParquetDataset, ParquetDataLoader
dataset = ParquetDataset('/path/to/parquet/dataset')
dataloader = ParquetDataLoader(dataset)
```
See examples in [tests](./tests).
## Benchmark
* fullly loading vs streaming loading
| | Time(s) | Memory(MB) |
| ----------------- | ------- | ---------- |
| fullly loading | 3.041 | 153 |
| streaming loading | 7.290 | 610 |
* synchronous loading vs asynchronous loading
| | Time(s) |
| -------------------- | ------- |
| synchronous loading | 39.204 |
| asynchronous loading | 25.854 |
See full results in [benckmarks](./benchmarks).