Experimental layer-wise quantization of cognitivecomputations/Dolphin-Mistral-24B-Venice-Edition

Using LLaMA C++ release b5600 for quantization.

Original model: cognitivecomputations/Dolphin-Mistral-24B-Venice-Edition

From the original model creators:

Discord Discord: https://discord.gg/h3K4XGj2RH
Website: https://dphn.ai
Twitter: https://x.com/dphnAI

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What is Dolphin Mistral 24B Venice Edition?

Dolphin Mistral 24B Venice Edition is a collaborative project we undertook with Venice.ai with the goal of creating the most uncensored version of Mistral 24B for use within the Venice ecosystem.

Dolphin Mistral 24B Venice Edition is now live on https://venice.ai/ as “Venice Uncensored,” the new default model for all Venice users.

Dolphin aims to be a general purpose model, similar to the models behind ChatGPT, Claude, Gemini. But these models present problems for businesses seeking to include AI in their products.

  1. They maintain control of the system prompt, deprecating and changing things as they wish, often causing software to break.
  2. They maintain control of the model versions, sometimes changing things silently, or deprecating older models that your business relies on.
  3. They maintain control of the alignment, and in particular the alignment is one-size-fits all, not tailored to the application.
  4. They can see all your queries and they can potentially use that data in ways you wouldn't want. Dolphin, in contrast, is steerable and gives control to the system owner. You set the system prompt. You decide the alignment. You have control of your data. Dolphin does not impose its ethics or guidelines on you. You are the one who decides the guidelines.

Dolphin belongs to YOU, it is your tool, an extension of your will. Just as you are personally responsible for what you do with a knife, gun, fire, car, or the internet, you are the creator and originator of any content you generate with Dolphin.

From Eric Hartford's, the creator of the Dolphin model series, Uncensored Models:

Most of these models (for example, Alpaca, Vicuna, WizardLM, MPT-7B-Chat, Wizard-Vicuna, GPT4-X-Vicuna) have some sort of embedded alignment. For general purposes, this is a good thing. This is what stops the model from doing bad things, like teaching you how to cook meth and make bombs. But what is the nature of this alignment? And, why is it so?

The reason these models are aligned is that they are trained with data that was generated by ChatGPT, which itself is aligned by an alignment team at OpenAI. As it is a black box, we don't know all the reasons for the decisions that were made, but we can observe it generally is aligned with American popular culture, and to obey American law...

PLEASE READ THIS BEFORE USING THESE EXPERIMENTAL VERSIONS!

An area of personal interest is finding ways to optimize the inference performance of LLMs when deployed in resource-constrained environments like commodity hardware, desktops, laptops, mobiles, edge devices, etc. There are many approaches to accomplish this, including architecture simplification and knowledge distillation, but my focus has been primarily on quantization and pruning.

The method used to produce these experimental versions is covered in Squeezing Tensor Bits: the quest for smaller LLMs, but at a high level it involves using a custom version of llama-imatrix and llama-quantize to identify influential tensors, and quantize the most important layers to higher bit precision and the less important to lower bits. This process was partly inspired by Dumitru's et al Layer-Wise Quantization: A Pragmatic and Effective Method for Quantizing LLMs Beyond Integer Bit-Levels.

As of version b5125 llama-quantize can now perform tensor-wide quantization (TWQ), whereby user-defined tensors are quantized at a specific level, or perform layer-wise quantization (LWQ) by selecting different quantization types per tensor/layer. For example, --tensor-type attn_v=q6_k will quantize all Attention Value tensors at q6_k (TWQ), and --tensor-type "\.([0-9]|1[01257]|31)\.attn_k=q4_k" will quantize Attention Key tensors on layers 0 to 9, 10, 11, 12, 15, 17 and 31 at q4_k, leaving the remaining layers at their default value (LWQ).

The modified version of llama-imatrix generates useful statistics to guide the tensor selection process, --show-statistics will display:

  • Σ(Act²): the sum of all squared activations over the tensor (i.e. the Importance Scores)
  • Min & Max: minimum and maximum squared activation values
  • μ & σ: activations' mean and standard deviation
  • % Active: proportion of elements whose average squared activation exceeds a very small threshold (1e-5). Helpful to determine how alive/dormant the tensor is during inference
  • N: number of squared activations in the tensor
  • Entropy: entropy of the squared activation distribution, in bits (standard Shannon entropy measurement)
  • E (norm): Normalized entropy.
  • ZD Score: z-score distribution as described in 3.1 Layer Importance Scores in the Layer-Wise Quantization paper
  • CosSim: cosine similarity between same type tensors with respect to the previous layer (i.e. blk.7.attn_k and blk.6.attn_k)

Please note that statistics are calculated for each individual tensor and should be used to compare between tensors of the same type only. For example, assuming that attn_k in layer 10 has a higher influence during inference than attn_k in layer 7 because its Σ(Act²) is larger makes sense, whilst concluding the same between attn_k and ffn_down does not.

There’s a pull request to merge these changes back into the core llama.cpp project. This may or may not ever happen so, until then, the modified version will be available on GitHub.

For testing and comparison I use models produced by Unsloth (Daniel and Michael Han do some really advanced level stuff!) and Bartowski (see credits below) but if they don't provide versions of the required model, all tests and comparisons are done against naive quantizations obtained by simply running llama-quantize with no further optimization.

All experimental versions were generated using an appropriate imatrix created from calibration datasets available at eaddario/imatrix-calibration. At its core, an Importance Matrix (imatrix) is a table or, more broadly, a structured representation that scores the relative importance of different features or parameters in a machine learning model. It essentially quantifies the "impact" each feature has on a specific outcome, prediction, or relationship being modelled, and it helps to counterbalance the negative effects of quantization and pruning.

The process to generate these models is roughly as follows:

  1. Convert the original model's tensors to GGUF F16*
  2. Estimate the Perplexity score for the F16 model (baseline) using the wikitext-2-raw-v1 dataset, and save the logits
  3. Generate an imatrix from selected calibration datasets
  4. Determine tensor and layer Importance Score contribution using the modified version of llama-imatrix
  5. Select an appropriate quant level for each tensor and quantize the model using llama-quantize
  6. Calculate Perplexity, KL Divergence, ARC (Easy+Challenge), HellaSwag, MMLU, Truthful QA and WinoGrande scores for each quantized model
  7. Keep versions with the best scores
  8. Repeat until all desired quants are created. I find that quantizations below Q3/IQ3 are not fit for my purposes and therefore do not usually generate them, but happy to provide other quants on request.

*BF16 would be preferred, but Apple's GPUs don't support it yet, and therefore any operations are executed in the CPU, making it unacceptably slow. This is expected to change in the near term but until then, if you are using Apple kit avoid using any models tagged BF16

Models

Sizes (in GB)

Perplexity and KL Divergence scores

Model μPPL 𝜌PPL μKLD RMS Δp
Dolphin-Mistral-24B-Venice-Edition-IQ3_M 6.982632 ±0.049472 97.79% 0.103385 ±0.000562 9.341 ±0.053
Dolphin-Mistral-24B-Venice-Edition-IQ3_S 7.363739 ±0.053846 97.05% 0.142269 ±0.000710 10.632 ±0.054
Dolphin-Mistral-24B-Venice-Edition-IQ4_NL 6.494645 ±0.044686 99.22% 0.034702 ±0.000219 5.662 ±0.041
Dolphin-Mistral-24B-Venice-Edition-Q3_K_L 6.664819 ±0.045809 97.93% 0.089022 ±0.000546 8.997 ±0.054
Dolphin-Mistral-24B-Venice-Edition-Q3_K_M 6.725143 ±0.045490 97.34% 0.122502 ±0.000669 11.044 ±0.057
Dolphin-Mistral-24B-Venice-Edition-Q3_K_S 6.988906 ±0.049047 96.56% 0.146027 ±0.000845 11.359 ±0.062
Dolphin-Mistral-24B-Venice-Edition-Q4_K_M 6.349140 ±0.042768 99.30% 0.029709 ±0.000211 5.279 ±0.039
Dolphin-Mistral-24B-Venice-Edition-Q4_K_M-bartowski 6.304728 ±0.042418 99.60% 0.016941 ±0.000138 4.031 ±0.037
Dolphin-Mistral-24B-Venice-Edition-Q4_K_S 6.443819 ±0.043899 99.20% 0.034773 ±0.000234 5.646 ±0.040
Dolphin-Mistral-24B-Venice-Edition-Q5_K_M 6.208247 ±0.041268 99.78% 0.009127 ±0.000080 3.001 ±0.032
Dolphin-Mistral-24B-Venice-Edition-Q5_K_S 6.230846 ±0.041563 99.73% 0.011255 ±0.000090 3.313 ±0.031
Dolphin-Mistral-24B-Venice-Edition-Q6_K 6.218229 ±0.041473 99.93% 0.002698 ±0.000035 1.625 ±0.020
Dolphin-Mistral-24B-Venice-Edition-Q8_0 6.181990 ±0.041079 99.97% 0.000739 ±0.000017 0.822 ±0.015
Dolphin-Mistral-24B-Venice-Edition-F16 6.180577 ±0.041038 100% N/A N/A

ARC, HellaSwag, MMLU, Truthful QA and WinoGrande scores

Scores generated using llama-perplexity with 750 tasks per test, and a context size of 768 tokens.

For the test data used in the generation of these scores, follow the appropriate links: HellaSwag, ARC, MMLU, Truthful QA and WinoGrande

Model ARC HellaSwag MMLU Truthful QA WinoGrande Avg Score
Dolphin-Mistral-24B-Venice-Edition-IQ3_M 68.1333 ±1.7026 83.60 45.0667 ±1.8180 38.5333 ±1.7783 77.8667 ±1.5169 62.64
Dolphin-Mistral-24B-Venice-Edition-IQ3_S 67.4667 ±1.7119 83.60 45.7333 ±1.8203 38.5333 ±1.7783 77.2000 ±1.5330 62.51
Dolphin-Mistral-24B-Venice-Edition-IQ4_NL 71.2000 ±1.6546 84.13 45.0667 ±1.8180 38.5333 ±1.7783 78.9333 ±1.4900 63.57
Dolphin-Mistral-24B-Venice-Edition-Q3_K_L 68.9333 ±1.6909 83.73 45.3333 ±1.8190 38.4000 ±1.7771 78.8000 ±1.4934 63.04
Dolphin-Mistral-24B-Venice-Edition-Q3_K_M 69.3333 ±1.6849 84.00 46.0000 ±1.8211 37.4667 ±1.7686 77.8667 ±1.5169 62.93
Dolphin-Mistral-24B-Venice-Edition-Q3_K_S 67.8667 ±1.7063 83.20 43.8667 ±1.8132 37.2000 ±1.7661 78.2667 ±1.5070 62.08
Dolphin-Mistral-24B-Venice-Edition-Q4_K_M 71.4667 ±1.6500 84.53 46.0000 ±1.8211 36.9333 ±1.7635 79.3333 ±1.4795 63.65
Dolphin-Mistral-24B-Venice-Edition-Q4_K_M-bartowski 69.8667 ±1.6766 84.27 45.3333 ±1.8190 37.6000 ±1.7699 80.2667 ±1.4542 63.47
Dolphin-Mistral-24B-Venice-Edition-Q4_K_S 70.4000 ±1.6680 84.00 46.1333 ±1.8215 36.5333 ±1.7594 79.4667 ±1.4760 63.31
Dolphin-Mistral-24B-Venice-Edition-Q5_K_M 70.1333 ±1.6723 84.93 44.9333 ±1.8176 37.8667 ±1.7724 79.7333 ±1.4688 63.52
Dolphin-Mistral-24B-Venice-Edition-Q5_K_S 69.6000 ±1.6807 84.40 45.0667 ±1.8180 37.6000 ±1.7699 80.2667 ±1.4542 63.39
Dolphin-Mistral-24B-Venice-Edition-Q6_K 70.0000 ±1.6744 84.53 45.4667 ±1.8194 37.7333 ±1.7711 80.2667 ±1.4542 63.60
Dolphin-Mistral-24B-Venice-Edition-Q8_0 70.8000 ±1.6614 84.53 45.6000 ±1.8199 38.5333 ±1.7783 80.6667 ±1.4430 64.03
Dolphin-Mistral-24B-Venice-Edition-F16 70.8000 ±1.6614 84.53 45.3333 ±1.8190 38.1333 ±1.7748 80.2667 ±1.4542 63.81

Tokens per Second - Benchmarks

Scores generated using llama-bench. Naive (llama-quantize with no optimization) Q4_K_M quantization included for comparison.

model size params backend threads test t/s
Dolphin-Mistral-24B-Venice-Edition-Q4_K_M 12.20 GiB 23.57 B Metal,BLAS 12 pp512 255.89 ±6.51
Dolphin-Mistral-24B-Venice-Edition-Q4_K_M 12.20 GiB 23.57 B Metal,BLAS 12 tg128 26.63 ±0.34
Dolphin-Mistral-24B-Venice-Edition-Q4_K_M 12.20 GiB 23.57 B Metal,BLAS 12 pp1024+tg1024 43.78 ±0.33
Dolphin-Mistral-24B-Venice-Edition-Q4_K_M-bartowski 13.34 GiB 23.57 B Metal,BLAS 12 pp512 253.67 ±2.26
Dolphin-Mistral-24B-Venice-Edition-Q4_K_M-bartowski 13.34 GiB 23.57 B Metal,BLAS 12 tg128 27.69 ±0.46
Dolphin-Mistral-24B-Venice-Edition-Q4_K_M-bartowski 13.34 GiB 23.57 B Metal,BLAS 12 pp1024+tg1024 45.54 ±0.18

Metrics used

Perplexity: one of the key metrics used in NLP evaluation. It measures the quality of a language model by evaluating how well it predicts the next token given a particular sequence of words. A PPL of 1 indicates an exact match between predicted and actual, whereas values greater than one indicate a degree of "surprise" the generated token differs from the expected.

Kullback–Leibler (KL) Divergence: a statistical measure of how much a probability distribution differs from another. When quantizing models (or altering the original tensors in any way for that matter), the closest we can preserve the weights' probability distribution to the original model the better, thus the closest to 0 the better.

AI2 Reasoning Challenge (ARC): a benchmark to evaluate the ability of AI models to answer complex science questions that require logical reasoning beyond pattern matching.

HellaSwag: the Harder Endings, Longer contexts, and Low-shot Activities for Situations With Adversarial Generations (bit of a mouthful!) is a benchmark designed to test commonsense natural language inference. It requires the model to predict the most likely ending of a sentence.

MMLU: the Massive Multitask Language Understanding evaluates LLMs’ general knowledge and problem-solving abilities across 57 subjects, including elementary mathematics, US history, computer science, and law.

Truthful QA: evaluates how well LLMs generate truthful responses to questions. It identifies whether AI models can avoid generating false or misleading information, particularly in areas where human knowledge is prone to misconceptions.

Winogrande: based on the Winograd Schema Challenge, is a natural language understanding task requiring models to resolve ambiguities in sentences involving pronoun references.

Credits

LLaMa C++ has a large and vibrant community of contributors (~1,200 last time I checked) that actively maintain and extend its functionality, adding new models and architectures almost as fast as they appear (considering the breakneck speed at which the AI/ML field is advancing, this alone is a remarkable feat!), and whilst I'm grateful to each and everyone of them, I want to recognise three people in particular: Thank You! Colin Kealty for the many contributions and for being one of the best sources of high quality quantized models available on Hugging Face, and a really big Thank You! to Georgi Gerganov for his amazing work with llama.cpp and the ggml/gguf libraries, and Iwan Kawrakow for being one of the key authors behind the many quantisation algorithms and the imatrix functionality.

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