add readme

README.md

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+---
+license: apache-2.0
+task_categories:
+- text-generation
+language:
+- en
+tags:
+- moE
+- olmoe
+- pretraining
+- allenai
+pretty_name: Tokenized OLMoE Mix
+size_categories:
+- 1B<n<10B
+---
+
+# Dataset Card for Tokenized OLMoE Mix
+
+## Dataset Summary
+This dataset contains pre-tokenized training and evaluation data designed for training custom small-scale **OLMoE (Mixture-of-Experts)** models. 
+
+The data is sourced primarily from the official AI2 Dolma 1 and C4 datasets and was curated to run ablation studies and reproduction experiments related to the [OLMoE Technical Paper (arXiv:2409.02060)](https://arxiv.org/abs/2409.02060). It is provided in `.npy` format, having been pre-tokenized using the `allenai/gpt-neox-olmo-dolma-v1_5` tokenizer.
+
+## Dataset Structure
+The dataset currently totals **7.38 GB** and is split into three parts for easier handling:
+* `part-0-00000.npy` (2.51 GB)
+* `part-0-00001.npy` (4.29 GB)
+* `part-0-00002.npy` (574 MB)
+
+## Data Sources & Composition
+Our training mix consists of approximately **4.7 Billion tokens** in total, built from the following sources:
+
+### 1. Training Data (3.689B tokens)
+* **Source:** A Wikipedia subset from Dolma 1.
+* **Original HF Dataset:** [`allenai/OLMoE-mix-0924`](https://huggingface.co/datasets/allenai/OLMoE-mix-0924)
+* **Command used to fetch raw data:**
+```bash
+wget -O data/wiki-001.json.gz "[https://huggingface.co/datasets/allenai/OLMoE-mix-0924/resolve/main/data/wiki/wiki-0001.json.gz?download=true](https://huggingface.co/datasets/allenai/OLMoE-mix-0924/resolve/main/data/wiki/wiki-0001.json.gz?download=true)"
+```