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Hoglet-33
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25BT-PreTrain-v2

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Cuban immigrationCubans are usually considered to be the most successful Hispanic immigrant group, with educational and economic profiles near those of the U.S. population as a whole. They constitute the third largest Hispanic immigrant group in the United States, behind only Mexicans and Puerto Ricans (see Hispanic an...
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from PyQt5 import QtWidgets , QtGui from PyQt5.QtCore import QRect , Qt from PyQt5.QtGui import QPen , QBrush , QColor function get_color color begin set tuple r g b = tuple max 0 - color max 0 color 0 return call QColor r * 255 g * 255 b * 255 end function class NeuralNetworkViewer extends QMainWindow begin function _...
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25BT-PreTrain-v2

Overview

25BT-PreTrain-v2 is a 25 billion token pretraining dataset designed for general-purpose language model training.

The dataset combines high-quality educational web text, general web text, mathematics, educational synthetic text, natural-language phrases, and Python code.

The dataset is distributed as shuffled Parquet shards with a single column named text.

This is the dataset used to train the first generation Pebble models.

Composition

Source	Share	Target Tokens	Approx. Rows	Avg. Tokens/Row
HuggingFaceFW/fineweb-edu	30%	7.50B	8.82M	~850
mlfoundations/dclm-baseline-1.0-parquet	20%	5.00B	3.90M	~1,281
HuggingFaceTB/smollm-corpus — cosmopedia-v2	15%	3.75B	5.77M	~650
matdmiller/finemath-4plus — full	15%	3.75B	2.63M	~1,428
HuggingFaceFW/finephrase — all	12%	3.00B	8.36M	~359
AxiomicLabs/NPset-python	8%	2.00B	1.74M	~1,150
Total	100%	25.00B	31.22M	—

Sources

FineWeb-Edu

Repository: HuggingFaceFW/fineweb-edu
Column: text
Contribution: 30%

DCLM

Repository: mlfoundations/dclm-baseline-1.0-parquet
Column: text
Contribution: 20%

Cosmopedia-v2

Repository: HuggingFaceTB/smollm-corpus
Configuration/folder: cosmopedia-v2
Column: text
Contribution: 15%

FineMath-4+

Repository: matdmiller/finemath-4plus
Configuration: full
Column: text
Contribution: 15%

FinePhrase

Repository: HuggingFaceFW/finephrase
Configuration: all
Column: text
Contribution: 12%

NPset-Python

Repository: AxiomicLabs/NPset-python
Source column: code
Output column: text
Contribution: 8%

Dataset Format

The final dataset contains approximately 31.22 million rows across Parquet shards.

Every shard contains exactly one column:

text: string

The code column from NPset-Python is renamed to text during dataset construction.

Shuffling

The dataset is not organized into large contiguous source blocks.

Sources are interleaved throughout construction according to the target token distribution, followed by a large buffered shuffle.

Shuffle buffer: 250,000 rows
Random seed: 42
Output format: Parquet
Compression: Zstandard

Intended Use

25BT-PreTrain-v2 is intended for language model pretraining.

It is designed as a general-purpose corpus with additional emphasis on:

Educational knowledge
Mathematics
Explanatory text
Programming
General language understanding

Version

Major changes from the previous dataset:

Increased from ~10B to 25B tokens
Consolidated into one dataset
Expanded source selection
Larger source pools
Improved token distribution
Source interleaving and buffered shuffling

Important Notes

The 25B-token figure is an estimate based on the measured average tokens per row for each source. The actual token count can vary depending on the tokenizer used for training.

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