trio-core 0.4.2

Local VLM inference engine for video — Apple Silicon, NVIDIA, and CPU

TrioCore

The fastest local VLM inference engine for Apple Silicon

73% faster prefill · 1.7x frame-to-frame · 68% fewer tokens · Zero Docker

Install | Quick Start | API Server | How It Works | Benchmarks | Models

---

Install

# Apple Silicon (M1-M4)
pipx install 'trio-core[mlx]'         # CLI tool (recommended)
pip install 'trio-core[mlx]'          # or as library in your project

# NVIDIA / CPU
pipx install 'trio-core[transformers]'
pip install 'trio-core[transformers]'

# With webcam/camera support
pipx install 'trio-core[mlx,gui]'

Quick Start

CLI

# Check your hardware
trio device

# Analyze a video
trio analyze video.mp4 -q "What is happening?"

# Live camera monitor — define what to watch in plain English
trio webcam -w "a person is waving"

# Start the API server
trio serve

Live Camera Monitor

# Default: detect if someone is holding something
trio webcam

# Custom watch conditions — just describe what to look for
trio webcam -w "a person is waving"
trio webcam -w "no safety helmet"
trio webcam -w "package missing from doorstep"
trio webcam -w "someone entered the restricted area"

# iPhone as camera (macOS Continuity Camera)
trio webcam -s 1 -w "a person is waving"

# IP camera via RTSP
trio webcam -s "rtsp://admin:pass@192.168.1.100:554/stream" -w "intruder detected"

Auto-calibrates resolution for ~500ms inference on any Mac. Green = clear, red = alert with audio notification. No ML training needed — just describe what to monitor.

Python

from trio_core import TrioCore

engine = TrioCore()
engine.load()

result = engine.analyze_video("clip.mp4", "What is happening?")
print(result.text)  # "A person is walking through the parking lot..."
print(f"{result.metrics.latency_ms:.0f}ms, {result.metrics.tokens_per_sec:.0f} tok/s")

Auto-optimize (default)

TrioCore automatically applies benchmark-proven optimizations based on the loaded model. No configuration needed — just load and go.

engine = TrioCore()
engine.load()  # auto-applies optimal compression for your model

To disable: EngineConfig(auto_optimize=False)

Manual optimizations

from trio_core import TrioCore, EngineConfig

config = EngineConfig(
    tome_enabled=True,    # merge visual tokens inside ViT (-68% tokens)
    tome_r=4,
    tome_metric="hidden",
)
engine = TrioCore(config)
engine.load()

API Server

trio serve --port 8000

Analyze a frame

curl -X POST http://localhost:8000/analyze-frame \
  -H "Content-Type: application/json" \
  -d '{"frame_b64": "<base64 jpeg>", "question": "Is there a person at the door?"}'

{"answer": "Yes, there is a person standing at the door.", "triggered": true, "latency_ms": 487}

Analyze a video

curl -X POST http://localhost:8000/v1/video/analyze \
  -H "Content-Type: application/json" \
  -d '{"video": "video.mp4", "prompt": "What is happening?"}'

OpenAI-compatible chat

curl -X POST http://localhost:8000/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "messages": [{"role": "user", "content": [
      {"type": "video", "video": "video.mp4"},
      {"type": "text", "text": "What is happening?"}
    ]}]
  }'

All endpoints

Endpoint	Method	Description
/healthz	GET	Health check
/health	GET	Detailed status + config
/analyze-frame	POST	Single frame: {frame_b64, question} → {answer, triggered, latency_ms}
/v1/video/analyze	POST	Video file analysis with metrics
/v1/frames/analyze	POST	Multi-frame upload (multipart)
/v1/chat/completions	POST	OpenAI-compatible (streaming SSE)
/v1/models	GET	Loaded model info

How It Works

TrioCore optimizes every stage of VLM inference. Each technique is independent and they compound:

Video → [Dedup] → [Motion Gate] → [ViT + ToMe] → [LLM + FastV] → [KV Reuse] → Answer
         -50%       -80% calls     -68% tokens    -50% tokens     1.7x reuse
        frames      when static    in encoder      in LLM         across frames

Stage	Technique	What it does	Speedup
Pre-inference	Temporal dedup	Skip near-identical frames (L2 on 64x64)	-50% frames
Pre-inference	Motion gate	Skip VLM entirely when scene is static	-80% calls
Vision encoder	ToMe	Merge similar visual tokens between ViT blocks	-73% prefill
LLM layers	FastV	Prune low-attention visual tokens from KV cache	-50% tokens
Cross-frame	KV Reuse	Reuse KV cache when frames are visually similar	1.7x speedup
Long video	StreamMem	Bounded KV cache with saliency eviction	constant memory

Benchmarks

Apple M3 Ultra, 4-bit quantized. Accuracy is hardware-independent (bit-identical output on any Apple Silicon). Latency scales proportionally across devices.

POPE — Object Hallucination (100 samples, yes/no)

Model	Params	Baseline	ToMe r=4	Compressed 50%	FastV
InternVL3-2B	2B	95%	—	94% (-1)	—
Qwen2.5-VL-3B	3B	94%	91% (-3)	75% (-19)	92% (-2)
Qwen3.5-2B	2B	94%	93% (-1)	93% (-1)	—
InternVL3-1B	1B	93%	—	94% (+1)	—
Qwen3.5-0.8B	0.8B	93%	94% (+1)	93% (0)	—
Qwen3-VL-2B	2B	92%	—	92% (0)	0%
Qwen3.5-9B	9B	92%	91% (-1)	90% (-2)	—
Qwen3-VL-8B	8B	91%	—	93% (+2)	75% (-16)
Qwen3-VL-4B	4B	91%	—	88% (-3)	85% (-6)
Qwen2.5-VL-7B	7B	90%	86% (-4)	90% (0)	✗
Qwen3.5-4B	4B	90%	89% (-1)	89% (-1)	—

TextVQA — OCR Reading (50 samples, open-ended)

Model	Params	Baseline	ToMe r=4	Compressed 50%	FastV
Qwen3.5-2B	2B	80%	78% (-2)	74% (-6)	—
InternVL3-2B	2B	78%	—	72% (-6)	—
Qwen3-VL-2B	2B	76%	—	76% (0)	66% (-10)
Qwen2.5-VL-3B	3B	72%	42% (-30)	60% (-12)	40% (-32)
Qwen3-VL-4B	4B	72%	—	72% (0)	56% (-16)
Qwen3.5-0.8B	0.8B	70%	64% (-6)	52% (-18)	—
Qwen3-VL-8B	8B	70%	—	70% (0)	54% (-16)
Qwen2.5-VL-7B	7B	66%	52% (-14)	68% (+2)	✗
Qwen3.5-9B	9B	56%	62% (+6)	56% (0)	—
Qwen3.5-4B	4B	52%	64% (+12)	52% (0)	—
InternVL3-1B	1B	50%	—	50% (0)	—

GQA — Visual Reasoning (50 samples, open-ended)

Model	Params	Baseline	ToMe r=4	Compressed 50%	FastV
Qwen3.5-2B	2B	68%	66% (-2)	68% (0)	—
InternVL3-2B	2B	66%	—	66% (0)	—
Qwen3-VL-4B	4B	66%	—	62% (-4)	50% (-16)
Qwen3.5-0.8B	0.8B	66%	60% (-6)	60% (-6)	—
InternVL3-1B	1B	62%	—	58% (-4)	—
Qwen2.5-VL-3B	3B	58%	54% (-4)	52% (-6)	42% (-16)
Qwen2.5-VL-7B	7B	58%	58% (0)	50% (-8)	—
Qwen3.5-4B	4B	58%	60% (+2)	64% (+6)	—
Qwen3.5-9B	9B	56%	64% (+8)	62% (+6)	—
Qwen3-VL-2B	2B	52%	—	58% (+6)	0%
Qwen3-VL-8B	8B	48%	—	54% (+6)	42% (-6)

MMBench — Multi-ability (50 samples, multiple choice)

Model	Params	Baseline	ToMe r=4	Compressed 50%	FastV
InternVL3-2B	2B	98%	—	96% (-2)	—
Qwen2.5-VL-7B	7B	96%	96% (0)	94% (-2)	—
Qwen3-VL-4B	4B	96%	—	94% (-2)	90% (-6)
Qwen3-VL-8B	8B	96%	—	94% (-2)	78% (-18)
Qwen3.5-9B	9B	96%	90% (-6)	96% (0)	—
Qwen2.5-VL-3B	3B	90%	82% (-8)	86% (-4)	66% (-24)
InternVL3-1B	1B	88%	—	86% (-2)	—
Qwen3-VL-2B	2B	84%	—	80% (-4)	2%
Qwen3.5-2B	2B	82%	82% (0)	82% (0)	—
Qwen3.5-0.8B	0.8B	58%	62% (+4)	54% (-4)	—
Qwen3.5-4B	4B	46%	44% (-2)	36% (-10)	—

MVBench — Video Understanding (12 tasks, 5 samples/task)

Model	Params	Baseline	Compressed 50%
Qwen3-VL-8B	8B	69%	57% (-12)
Qwen3.5-2B	2B	65%	57% (-8)
Qwen2.5-VL-7B	7B	63%	61% (-2)
Qwen3-VL-2B	2B	63%	54% (-9)
Qwen3-VL-4B	4B	63%	54% (-9)
Qwen2.5-VL-3B	3B	61%	59% (-2)
Qwen3.5-0.8B	0.8B	50%	46% (-4)
Qwen3.5-9B	9B	37%	37% (0)
Qwen3.5-4B	4B	2%	2% (0)
InternVL3	1-2B	—	—

— = architecturally incompatible (auto-skipped). ✗ = produces garbage output. ToMe incompatible with Qwen3-VL (deepstack) and InternVL3 (pixel shuffle). FastV incompatible with Qwen3.5 (DeltaNet), InternVL3, Qwen2.5-VL-7B (over-prunes), and Qwen3-VL-2B (garbage output). InternVL3 does not support multi-image/video inference (MVBench). Qwen3.5-4B: known 4-bit quantization issue on MCQ/video benchmarks (official FP16: MMBench 89%, our 4-bit: 46%).

Latency — ms/sample (POPE)

Model	Baseline	ToMe r=4	Compressed 50%	FastV	Best Speedup
Qwen3.5-0.8B	148ms	167ms	135ms	—	1.09x
Qwen3.5-2B	251ms	297ms	221ms	—	1.14x
Qwen3-VL-2B	275ms	—	223ms	226ms	1.23x
Qwen2.5-VL-3B	354ms	629ms	279ms	288ms	1.27x
Qwen3.5-4B	407ms	454ms	337ms	—	1.20x
Qwen3-VL-4B	414ms	—	335ms	341ms	1.24x
Qwen2.5-VL-7B	522ms	693ms	384ms	—	1.36x
Qwen3-VL-8B	633ms	—	503ms	516ms	1.26x
Qwen3.5-9B	632ms	694ms	506ms	—	1.25x
InternVL3-1B	677ms	—	577ms	—	1.17x
InternVL3-2B	967ms	—	736ms	—	1.31x

Frame-to-frame (KV cache reuse, 480p 5-frame video)

Model	Speedup	Architecture
Qwen2.5-VL-3B	1.57x	KV cache reuse
Qwen3-VL-4B	1.71x	KV cache reuse
Qwen3.5-0.8B	1.35x	DeltaNet state snapshot

Overhead vs mlx-vlm (raw generate loop)

Metric	mlx-vlm	trio-core
Prefill	1018ms	1016ms (-0.2%)
Decode	524ms	513ms (-2.1%)
Output	—	bit-identical

Supported Models

Tier 1 — Full optimization (native loading, all 4 stages)

Model	Size	4-bit	ToMe	FastV	Compressed	KV Reuse
Qwen2.5-VL 3B	3B	1.8G	✓	✓	✓	✓
Qwen2.5-VL 7B	7B	4.5G	✓	✗	✓	✓
Qwen3-VL 2B/4B/8B	2-8B	1.5-5.0G	—	✓	✓	✓
Qwen3.5 0.8B/2B/4B/9B	0.8-9B	0.5-5.0G	✓	—	✓	✓ (DeltaNet)
InternVL3 1B/2B	1-2B	1.0-1.6G	—	—	✓	✓

Tier 2 — Inference only (mlx-vlm, no optimization)

Gemma 3n, SmolVLM2, Phi-4, Gemma 3, FastVLM, and any model supported by mlx-vlm.

Configuration

All settings via TRIO_ environment variables or EngineConfig:

TRIO_MODEL=mlx-community/Qwen2.5-VL-3B-Instruct-4bit
TRIO_TOME_ENABLED=true
TRIO_TOME_R=4
TRIO_PORT=8000

See trio_core/config.py for all options.

License

Apache 2.0