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from hqq.core.quantize import BaseQuantizeConfig, HQQLinear
import torch.nn as nn
# Configure quantizationconfig = BaseQuantizeConfig( nbits=4,# 4-bit quantization group_size=64,# Group size for quantization axis=1# Quantize along output dimension)# Quantize a linear layerlinear = nn.Linear(4096,4096)hqq_linear = HQQLinear(linear, config)# Use normallyoutput = hqq_linear(input_tensor)
Quantize full model with HuggingFace
from transformers import AutoModelForCausalLM, HqqConfig
# Configure HQQquantization_config = HqqConfig( nbits=4, group_size=64, axis=1)# Load and quantizemodel = AutoModelForCausalLM.from_pretrained("meta-llama/Llama-3.1-8B", quantization_config=quantization_config, device_map="auto")# Model is quantized and ready to use
Core concepts
Quantization configuration
HQQ uses BaseQuantizeConfig to define quantization parameters:
from hqq.core.quantize import BaseQuantizeConfig
# Standard 4-bit configconfig_4bit = BaseQuantizeConfig( nbits=4,# Bits per weight (1-8) group_size=64,# Weights per quantization group axis=1# 0=input dim, 1=output dim)# Aggressive 2-bit configconfig_2bit = BaseQuantizeConfig( nbits=2, group_size=16,# Smaller groups for low-bit axis=1)# Mixed precision per layer typelayer_configs ={"self_attn.q_proj": BaseQuantizeConfig(nbits=4, group_size=64),"self_attn.k_proj": BaseQuantizeConfig(nbits=4, group_size=64),"self_attn.v_proj": BaseQuantizeConfig(nbits=4, group_size=64),"mlp.gate_proj": BaseQuantizeConfig(nbits=2, group_size=32),"mlp.up_proj": BaseQuantizeConfig(nbits=2, group_size=32),"mlp.down_proj": BaseQuantizeConfig(nbits=4, group_size=64),}
HQQ supports multiple inference backends for different hardware:
from hqq.core.quantize import HQQLinear
# Available backendsbackends =["pytorch",# Pure PyTorch (default)"pytorch_compile",# torch.compile optimized"aten",# Custom CUDA kernels"torchao_int4",# TorchAO int4 matmul"gemlite",# GemLite CUDA kernels"bitblas",# BitBlas optimized"marlin",# Marlin 4-bit kernels]# Set backend globallyHQQLinear.set_backend("torchao_int4")# Or per layerhqq_layer.set_backend("marlin")
Backend selection guide:
Backend
Best For
Requirements
pytorch
Compatibility
Any GPU
pytorch_compile
Moderate speedup
torch>=2.0
aten
Good balance
CUDA GPU
torchao_int4
4-bit inference
torchao installed
marlin
Maximum 4-bit speed
Ampere+ GPU
bitblas
Flexible bit-widths
bitblas installed
HuggingFace integration
Load pre-quantized models
from transformers import AutoModelForCausalLM, AutoTokenizer
# Load HQQ-quantized model from Hubmodel = AutoModelForCausalLM.from_pretrained("mobiuslabsgmbh/Llama-3.1-8B-HQQ-4bit", device_map="auto")tokenizer = AutoTokenizer.from_pretrained("meta-llama/Llama-3.1-8B")# Use normallyinputs = tokenizer("Hello, world!", return_tensors="pt").to(model.device)outputs = model.generate(**inputs, max_new_tokens=50)
Quantize and save
from transformers import AutoModelForCausalLM, HqqConfig
# Quantizeconfig = HqqConfig(nbits=4, group_size=64)model = AutoModelForCausalLM.from_pretrained("meta-llama/Llama-3.1-8B", quantization_config=config, device_map="auto")# Save quantized modelmodel.save_pretrained("./llama-8b-hqq-4bit")# Push to Hubmodel.push_to_hub("my-org/Llama-3.1-8B-HQQ-4bit")
Mixed precision quantization
from transformers import AutoModelForCausalLM, HqqConfig
# Different precision per layer typeconfig = HqqConfig( nbits=4, group_size=64,# Attention layers: higher precision# MLP layers: lower precision for memory savings dynamic_config={"attn":{"nbits"
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Make data-driven prioritization decisions faster
Stakeholder Communication
Draft PRDs, status updates, and stakeholder presentations
βΊAccess to product documentation and roadmap tools (Jira, Notion, etc.)
βΊUnderstanding of product management frameworks (RICE, Jobs-to-be-Done, etc.)
βΊStakeholder contact information and communication channels
Time Estimate
30-60 minutes to see productivity improvements
Steps
1Install product management skill
2Start with user story generation for known feature
3Progress to competitive analysis: research 2-3 competitors
4Use for roadmap prioritization: apply RICE/ICE scoring
5Draft stakeholder communications and refine based on feedback
6Build template library for recurring PM tasks
7Share effective prompts with product team
Common Pitfalls
β Not validating competitive researchβverify facts before sharing
β Accepting user stories without involving engineering team
β Over-relying on frameworks without qualitative judgment
β Not customizing outputs to company culture and communication style
β Skipping stakeholder validation of generated requirements
Best Practices
β Do
+Validate research and competitive analysis with real data
+Collaborate with engineering when generating technical requirements
+Customize frameworks and templates to your company context
+Use skill for first drafts, refine with stakeholder input
+Document successful prompt patterns for PM tasks
+Combine AI efficiency with human judgment and intuition
β Don't
βDon't publish competitive analysis without fact-checking
βDon't finalize user stories without engineering review
βDon't make prioritization decisions solely on AI scoring
βDon't skip customer validation of generated requirements
βDon't ignore company-specific context and culture
π‘ Pro Tips
β Provide context: company goals, constraints, customer feedback
β Ask for alternatives: 'Show 3 ways to prioritize this roadmap'
β Request stakeholder-specific formatting: 'Executive summary vs. engineering spec'
β Use skill for 70% generation + 30% customization to company needs
When to Use This
β Use when
Use for user story writing, competitive research, roadmap prioritization, stakeholder communication, and PRD drafting. Best for reducing repetitive documentation and research work.
β Avoid when
Avoid for strategic product vision (requires deep customer empathy), pricing decisions (needs market and financial expertise), or when face-to-face customer discovery is more valuable than speed.
Learning Path
1Basic: user stories, feature specs, status updates