---
license: mit
task_categories:
- text-classification
language:
- en
tags:
- text-generation
- causal
- training
- transformers
- pytorch
- jsonl
- segmentation
- validation
size_categories:
- 10M<n<100M
---


# 📚 TinyWay-Gutenberg-Clean-40M

A large-scale, high-quality English text dataset derived from Project Gutenberg, cleaned, normalized, deduplicated, and segmented into fixed-length samples for efficient language model pretraining.

This dataset is designed to support training small and medium language models such as **TinyWay**, tokenizer training, embedding models, and large-scale NLP experimentation.

---

## Dataset Overview

* **Name:** TinyWay-Gutenberg-Clean-40M
* **Samples:** ~40,000,000
* **Language:** English
* **Format:** JSONL (optionally gzip-compressed)
* **Source:** Project Gutenberg (public domain books)
* **License:** Public Domain
* **Intended Use:** Language model pretraining, tokenizer training, representation learning

Each line in the dataset contains a clean text segment between **30 and 60 words**.

---

## Data Format

Each record is stored as a JSON object:

```json
{
  "id": "twg_000000000123",
  "text": "Cleaned text segment of natural English language between thirty and sixty words.",
  "word_count": 42,
  "source": "gutenberg"
}
```

### Fields

| Field        | Description                   |
| ------------ | ----------------------------- |
| `id`         | Unique sample identifier      |
| `text`       | Clean English text segment    |
| `word_count` | Number of words in the sample |
| `source`     | Data source identifier        |

---

##  Data Processing Pipeline

The dataset was generated using a fully streaming pipeline to ensure scalability and low memory usage.

### Steps

1. **Streaming Input**

   * Data loaded from a Project Gutenberg mirror using Hugging Face streaming APIs.

2. **Text Cleaning**

   * Removed Gutenberg headers and footers
   * Removed chapter titles and page numbers
   * Normalized whitespace and line breaks
   * Removed non-ASCII and control characters
   * Removed URLs and artifacts

3. **Segmentation**

   * Text split into fixed segments of **30–60 words**.

4. **Validation**

   * Enforced word count constraints
   * Filtered short or malformed segments

5. **Deduplication**

   * Exact hash-based deduplication applied during generation.

6. **Output**

   * Stored as JSONL files (optionally gzip-compressed).
   * Sharded for easier distribution and loading.

---

## How to Load the Dataset

### Using Hugging Face Datasets

```python
from datasets import load_dataset

dataset = load_dataset(
    "NNEngine/TinyWay-Gutenberg-Clean-40M",
    split="train",
    streaming=True
)

for sample in dataset.take(3):
    print(sample)
```

---

### Reading JSONL Manually

```python
import json

with open("data/train-00000.jsonl", "r", encoding="utf-8") as f:
    for _ in range(3):
        print(json.loads(next(f)))
```

If files are compressed:

```python
import gzip
import json

with gzip.open("train-00000.jsonl.gz", "rt", encoding="utf-8") as f:
    for _ in range(3):
        print(json.loads(next(f)))
```

---

##  Dataset Characteristics

Approximate properties:

* **Average words per sample:** ~45
* **Vocabulary:** Large natural English vocabulary
* **Style:** Literary and narrative English
* **Domain:** Fiction, non-fiction, historical texts

---

## Limitations

* Content is primarily literary and historical in nature.
* No conversational, chat, or code data.
* Some archaic vocabulary and sentence structure may appear.
* Deduplication is hash-based (near-duplicates may remain).

For conversational or modern web text, additional datasets should be mixed.

---

## License

All source texts originate from Project Gutenberg and are in the **public domain**.
This processed dataset is released for unrestricted research and commercial use.

---

## Citation

If you use this dataset in research or publications, please cite:

```
TinyWay-Gutenberg-Clean-40M
NNEngine, 2026
```

---

## 🧠 Maintainer

Created and maintained by **Shivam Sharma**