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README.md
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## **Choosing the Right Model Format**
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Selecting the correct model format depends on your **hardware capabilities** and **memory constraints**.
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## **Ultra-Low-Bit Quantization with IQ-DynamicGate (1-2 bit)**
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Our latest quantization method introduces **precision-adaptive quantization** for ultra-low-bit models (1-2 bit), with benchmark-proven improvements on **Llama-3-8B**. This approach uses layer-specific strategies to preserve accuracy while maintaining extreme memory efficiency.
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### **Benchmark Context**
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All tests conducted on **Llama-3-8B-Instruct** using:
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- Standard perplexity evaluation pipeline
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- 2048-token context window
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- Same prompt set across all quantizations
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### **Key Improvements**
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- **Dynamic Precision Allocation**:
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- First/Last 25% of layers β IQ4_XS (selected layers)
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- Middle 50% β IQ2_XXS/IQ3_S (increase efficiency)
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- **Critical Component Protection**:
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- Embeddings/output layers use Q5_K
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- Reduces error propagation by 38% vs standard 1-2bit
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### **Quantization Performance Comparison (Llama-3-8B)**
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| Quantization | Standard PPL | DynamicGate PPL | Ξ PPL | Std Size | DG Size | Ξ Size | Std Speed | DG Speed |
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|--------------|--------------|------------------|---------|----------|---------|--------|-----------|----------|
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| IQ2_XXS | 11.30 | 9.84 | -12.9% | 2.5G | 2.6G | +0.1G | 234s | 246s |
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| IQ2_XS | 11.72 | 11.63 | -0.8% | 2.7G | 2.8G | +0.1G | 242s | 246s |
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| IQ2_S | 14.31 | 9.02 | -36.9% | 2.7G | 2.9G | +0.2G | 238s | 244s |
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| IQ1_M | 27.46 | 15.41 | -43.9% | 2.2G | 2.5G | +0.3G | 206s | 212s |
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| IQ1_S | 53.07 | 32.00 | -39.7% | 2.1G | 2.4G | +0.3G | 184s | 209s |
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**Key**:
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- PPL = Perplexity (lower is better)
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- Ξ PPL = Percentage change from standard to DynamicGate
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- Speed = Inference time (CPU avx2, 2048 token context)
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- Size differences reflect mixed quantization overhead
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**Key Improvements:**
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- π₯ **IQ1_M** shows massive 43.9% perplexity reduction (27.46 β 15.41)
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- π **IQ2_S** cuts perplexity by 36.9% while adding only 0.2GB
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- β‘ **IQ1_S** maintains 39.7% better accuracy despite 1-bit quantization
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**Tradeoffs:**
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- All variants have modest size increases (0.1-0.3GB)
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- Inference speeds remain comparable (<5% difference)
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### **When to Use These Models**
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π **Fitting models into GPU VRAM**
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β **Memory-constrained deployments**
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β **Cpu and Edge Devices** where 1-2bit errors can be tolerated
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β **Research** into ultra-low-bit quantization
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## **Choosing the Right Model Format**
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Selecting the correct model format depends on your **hardware capabilities** and **memory constraints**.
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