echo-vector 1.0.3

Semantic text search over audio files without full transcription

🔊 EchoVector

Semantic text search over audio files — without full transcription.

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What is EchoVector?

EchoVector indexes audio files by generating semantic embeddings directly from audio waveforms, then lets you search them with natural language text queries — all without transcribing a single word.

Traditional approach (slow & expensive)

Audio → Full Transcription → Text Embeddings → Text Search

EchoVector approach (fast & efficient)

Audio → Audio Chunks → Audio Embeddings ─┐
                                          ├─► ANN Search → Results
Text Query → Text Embedding ──────────────┘

Features

• 🎵 Multi-format support — MP3, WAV, FLAC, M4A
• 🧠 Direct audio embeddings — No transcription needed
• 🔍 Semantic search — Query with natural language
• ⚡ FAISS-powered — Approximate nearest neighbor search
• 🔌 Pluggable backends — CLAP, Whisper, wav2vec2, HuBERT, AST
• 🧪 Offline smoke backend — local backend for CI/Kaggle tests without model downloads
• 📊 Rich CLI — Progress bars, colors, benchmarking mode
• 🌐 REST API — Optional FastAPI server
• 📦 Production-ready — Typed, tested, documented

Quick Start

Installation

pip install echo_vector

Or with uv:

uv add echo_vector

CLI Usage

# One-time indexing: split audio into timestamped chunks and embed each chunk
echovector index ./meetings

# Fast repeated search: embed only the text query and search the saved FAISS index
echovector search "discussion about transformers"

# Search with options
echovector search "pricing strategy" --top-k 10

# View index statistics
echovector stats

For a no-download smoke test, use the deterministic local backend:

echovector index ./meetings --backend local --store-dir ./ev-index
echovector search "high alarm tone" --backend local --store-dir ./ev-index
echovector stats --backend local --store-dir ./ev-index

The search command does not reopen or scan the audio files. All expensive audio processing happens during index; search loads the saved vector index, embeds the short text query, and returns the nearest timestamped chunks.

Python API

from echovector import EchoVector

ev = EchoVector()

# Index audio files
ev.index("./meetings")

# Search with natural language
results = ev.search("conversation about CUDA kernels")

for r in results:
    print(
        f"{r.filepath} "
        f"[{r.timestamp_range.start:.1f}s - {r.timestamp_range.end:.1f}s] "
        f"score={r.score:.4f}"
    )

Testing on Kaggle

Kaggle is useful for GPU-backed CLAP tests, but first check the runtime Python version:

import sys
print(sys.version)

EchoVector currently declares Python >=3.12. If the Kaggle image is older, install and test in a Python 3.12-capable environment instead, or relax the project requirement only after validating the test suite on that Python version.

Notebook smoke test without internet/model downloads

Upload this repository as a Kaggle dataset, attach it to a notebook, then run:

%cd /kaggle/input/<your-echo-vector-dataset>
!pip install -e . --no-deps
!pip install numpy soundfile librosa faiss-cpu typer rich pydantic
!python -m pytest tests/ -q

Create a tiny audio corpus and test the real CLI/index path:

import os
import numpy as np
import soundfile as sf

audio_dir = "/kaggle/working/ev-audio"
index_dir = "/kaggle/working/ev-index"
os.makedirs(audio_dir, exist_ok=True)

sr = 16000
t = np.linspace(0, 1.0, sr, endpoint=False)
sf.write(f"{audio_dir}/high_tone.wav", 0.25 * np.sin(2 * np.pi * 880 * t), sr)
sf.write(f"{audio_dir}/low_tone.wav", 0.25 * np.sin(2 * np.pi * 110 * t), sr)

!echovector index /kaggle/working/ev-audio --backend local --store-dir /kaggle/working/ev-index --reset
!echovector search "high alarm tone" --backend local --store-dir /kaggle/working/ev-index --top-k 2
!echovector stats --backend local --store-dir /kaggle/working/ev-index

This validates packaging, audio loading, FAISS persistence, metadata storage, and the CLI without depending on Hugging Face downloads.

CLAP semantic test

For actual semantic text-to-audio search, enable internet in the notebook settings and use a GPU runtime if available:

!pip install transformers torch faiss-cpu librosa soundfile
!echovector index /kaggle/input/<audio-dataset> --backend clap --device cuda --store-dir /kaggle/working/clap-index --recursive --reset
!echovector search "people discussing pricing strategy" --backend clap --device cuda --store-dir /kaggle/working/clap-index --top-k 10

If GPU is unavailable, replace --device cuda with --device cpu; it will be slower. Keep indexes under /kaggle/working so they are writable during the notebook session.

Architecture

echovector/
├── audio/        # Audio loading, chunking, streaming, metadata
├── embeddings/   # Pluggable embedding backends (CLAP, Whisper, etc.)
├── indexing/     # Vector index backends (FAISS, with pluggable design)
├── search/       # Search engine, filtering, result hydration
├── cli/          # Typer-based CLI with Rich output
├── api/          # Optional FastAPI server
├── evaluation/   # Metrics (recall@k, throughput)
├── benchmarks/   # Reproducible benchmark harness
└── utils/        # Config, logging, helpers

Supported Embedding Backends

Backend	Text+Audio Aligned	Notes
CLAP (default)	✅	Best for text→audio search
Whisper Encoder	❌	Audio-only embeddings
wav2vec2	❌	Audio-only, good for speech
HuBERT	❌	Audio-only, self-supervised
Audio Spectrogram Transformer	❌	Audio-only, classification-focused

Development

# Clone and install
git clone https://github.com/echovector/echovector.git
cd echovector
uv sync --all-extras

# Run checks
make lint
make typecheck
make test
make coverage

License

MIT