---
language:
- en
license: other
pretty_name: IMDb Sentiment (35k/5k/10k)
size_categories: 10K<n<100K
task_categories:
- text-classification
task_ids:
- sentiment-classification
annotations_creators:
- expert-generated
language_creators:
- expert-generated
multilinguality:
- monolingual
source_datasets:
- original
---

# IMDb Sentiment Classification

A curated version of the [Large Movie Review Dataset](https://ai.stanford.edu/~amaas/data/sentiment/) with custom train/validation/test splits optimized for model training and evaluation.

## Dataset Summary

This dataset contains **50,000 labeled movie reviews** from IMDb, each labeled as **positive (1)** or **negative (0)**. The data originates from the Stanford AI Lab's Large Movie Review Dataset, re-split into 35k/5k/10k for better validation during training.

## Splits

| Split | Samples | Positive | Negative |
|-------|---------|----------|----------|
| **train** | 35,000 | 17,500 | 17,500 |
| **validation** | 5,000 | 2,500 | 2,500 |
| **test** | 10,000 | 5,000 | 5,000 |
| **Total** | **50,000** | **25,000** | **25,000** |

The dataset is balanced — each split has roughly equal positive and negative reviews.

## Data Fields

- **`text`** (`string`): The movie review text (English).
- **`label`** (`int`): Sentiment label — `0` for negative, `1` for positive.

## Usage

```python
from datasets import load_dataset

ds = load_dataset("Mustafaege/imdb-sentiment")

# Access splits
train_ds = ds["train"]       # 35,000 samples
val_ds = ds["validation"]    # 5,000 samples
test_ds = ds["test"]         # 10,000 samples

# Example
print(train_ds[0])
# {'text': 'This movie was absolutely fantastic...', 'label': 1}
```

## Source

- **Original dataset**: [Stanford Large Movie Review Dataset](https://ai.stanford.edu/~amaas/data/sentiment/)
- **Original HF mirror**: [stanfordnlp/imdb](https://huggingface.co/datasets/stanfordnlp/imdb)
- **Paper**: Maas et al., "Learning Word Vectors for Sentiment Analysis", ACL 2011

## Citation

```bibtex
@InProceedings{maas-EtAl:2011:ACL-HLT2011,
  author    = {Maas, Andrew L. and Daly, Raymond E. and Pham, Peter T. and Huang, Dan and Ng, Andrew Y. and Potts, Christopher},
  title     = {Learning Word Vectors for Sentiment Analysis},
  booktitle = {Proceedings of the 49th Annual Meeting of the Association for Computational Linguistics: Human Language Technologies},
  month     = {June},
  year      = {2011},
  address   = {Portland, Oregon, USA},
  publisher = {Association for Computational Linguistics},
  pages     = {142--150},
  url       = {http://www.aclweb.org/anthology/P11-1015}
}
```

## License

The IMDb dataset is provided for academic research use. See the [original dataset page](https://ai.stanford.edu/~amaas/data/sentiment/) for licensing details.