[Feature Request] Implement Streaming Hint Injection with RL-Trained Retriever

[codelion]

🎯 Overview

Implement a novel inference optimization approach inspired by this research idea: a lightweight retriever that processes streaming Chain-of-Thought reasoning to inject contextual hints from a memory bank, trained using downstream task performance as the reward signal.

This would make optillm the first framework to support real-time, RL-trained hint injection during LLM reasoning.

🔬 Problem Description

Current LLM inference approaches either:

• Provide all context upfront (overwhelming and unfocused)
• Generate responses without external guidance (missing relevant knowledge)
• Use static retrieval (not adaptive to reasoning progress)

Will Brown's approach solves this by:

1. Monitoring the model's reasoning stream in real-time
2. Retrieving relevant hints from a memory bank at strategic moments
3. Injecting hints precisely when they're most helpful
4. Learning optimal injection strategies through RL using downstream task performance

🏗️ Proposed Architecture

Implementation Structure

Create a new folder optillm/streaming_hints/ (similar to optillm/autothink/) containing:

optillm/streaming_hints/
├── __init__.py
├── README.md                    # Detailed implementation documentation
├── streaming_hints.py           # Main approach implementation
├── memory_bank.py              # Hint storage and retrieval
├── retriever.py                # Streaming hint injection logic
├── rl_trainer.py               # Reinforcement learning components
└── evaluator.py                # Performance evaluation utilities

Core Components

# optillm/streaming_hints/streaming_hints.py
class StreamingHintsApproach:
    def __init__(self):
        self.SLUG = "streaming_hints"  # or "sh" for short
        self.memory_bank = HintMemoryBank()
        self.retriever = StreamingHintRetriever(self.memory_bank)
        self.trainer = HintRetrievalRLTrainer(self.retriever)

1. Hint Memory Bank (memory_bank.py)

• Store curated hints with embeddings
• Support vector similarity search
• Track usage statistics and effectiveness

2. Streaming Hint Retriever (retriever.py)

• Process CoT reasoning token-by-token
• Detect optimal injection points (uncertainty signals, reasoning transitions)
• Retrieve relevant hints using embedding similarity
• Inject hints as <hint>content</hint> tags in the stream

3. RL Training System (rl_trainer.py)

• Compare performance with/without hints
• Use downstream task accuracy as reward signal
• Train injection timing and hint selection policies
• Support multiple domains (math, coding, reasoning)

4. Documentation (README.md)

The folder's README should include:

• Overview: What streaming hint injection accomplishes
• Architecture: How components work together
• Implementation Details: Key algorithms and design decisions
• Usage Examples: Code samples and configuration options
• Evaluation Results: Benchmark performance and comparisons
• Future Work: Potential improvements and extensions

🎨 Integration with Existing optillm

This builds naturally on existing approaches:

• Memory Plugin: Extend for hint storage and retrieval
• Router Plugin: Similar classification concept for hint relevance
• CoT Reflection: Compatible with structured reasoning sections
• MCP Plugin: Shows how to integrate external tools during reasoning

Usage Examples

# Via model name prefix
model="streaming_hints-gpt-4o-mini"

# Combined with existing approaches
model="streaming_hints&cot_reflection-gpt-4o-mini"  # Pipeline
model="streaming_hints|moa-gpt-4o-mini"             # Parallel

# With custom configuration
extra_body={"optillm_approach": "streaming_hints", "hint_threshold": 0.8}

📊 Expected Benefits

1. Performance: Significant improvements on complex reasoning tasks
2. Efficiency: Targeted hint injection vs. overwhelming context
3. Adaptability: RL learns optimal strategies for different domains
4. Composability: Works with existing optillm approaches
5. Innovation: Novel real-time reasoning enhancement

🧪 Testing Strategy

Benchmark Tasks

• Math: GSM8K, MATH dataset problems
• Coding: HumanEval, MBPP coding challenges
• Reasoning: LogiQA, ReClor logical reasoning
• General: MMLU multi-domain questions

Evaluation Metrics

• Accuracy improvement vs. baseline
• Token efficiency (performance per token)
• Hint relevance and timing effectiveness

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This is a high-impact feature that could significantly advance the field of LLM inference optimization. Looking forward to collaborating with the community to bring this innovative approach to life! 🚀

[MannXo]

I canb work on this one. can someone assign it to me please?