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Index-1.9B

Model Introduction

We are excited to announce the release of a lightweight version from the Index series models: the Index-1.9B series. The open-source Index-1.9B series includes the following models:

  • Index-1.9B base (this repository's model) : The base model, with 1.9 billion non-embedding parameters, pre-trained on a 2.8T corpus mainly in Chinese and English. It leads in multiple evaluation benchmarks compared to models of the same level.
  • Index-1.9B pure : A control version of the base model with the same parameters and training strategy, but strictly filtered out all instruction-related data from the corpus to verify the impact of instructions on benchmarks.
  • Index-1.9B chat: A dialogue model aligned with SFT and DPO based on the Index-1.9B base. We found that due to the introduction of a lot of internet community corpus in our pre-training, the model has significantly more interesting chatting capabilities.
  • Index-1.9B character : Introduces RAG on top of SFT and DPO to achieve few-shots role-playing customization.

Note: This is the Base model, capable only of continuation and further training alignment, and cannot be directly interacted with.

For more details, see our GitHub and Index-1.9B Technical Report

Evaluation Results

The Index-1.9B shows excellent performance in general understanding evaluations, leading compared to recently open-sourced small models and comparable to some 7B and models larger than 10B.

Model Average score Average English score MMLU CEVAL CMMLU HellaSwag Arc-C Arc-E
Google Gemma 2B 41.58 46.77 41.81 31.36 31.02 66.82 36.39 42.07
Phi-2 (2.7B) 58.89 72.54 57.61 31.12 32.05 70.94 74.51 87.1
Qwen1.5-1.8B 58.96 59.28 47.05 59.48 57.12 58.33 56.82 74.93
Qwen2-1.5B(report) 65.17 62.52 56.5 70.6 70.3 66.6 43.9 83.09
MiniCPM-2.4B-SFT 62.53 68.75 53.8 49.19 50.97 67.29 69.44 84.48
Index-1.9B-Pure 49.55 52.83 43.75 42.35 43.61 63.21 42.75 61.61
Index-1.9B 64.92 69.93 52.53 57.01 52.79 80.69 65.15 81.35
Llama2-7B 50.79 60.31 44.32 32.42 31.11 76 46.3 74.6
Mistral-7B (report) / 69.23 60.1 / / 81.3 55.5 80
Baichuan2-7B 54.53 53.51 54.64 56.19 56.95 25.04 57.25 77.12
Llama2-13B 57.51 66.61 55.78 39.93 38.7 76.22 58.88 75.56
Baichuan2-13B 68.90 71.69 59.63 59.21 61.27 72.61 70.04 84.48
MPT-30B (report) / 63.48 46.9 / / 79.9 50.6 76.5
Falcon-40B (report) / 68.18 55.4 / / 83.6 54.5 79.2

Evaluation code is based on OpenCompass with compatibility modifications. See the evaluate folder for details.