Getting Started

This quick-start guide will help you build and run your first encoderfile in under 10 minutes.

Prerequisites

encoderfile CLI Tool

You need the encoderfile CLI tool installed:

• Pre-built binary (recommended) - Fastest setup for Linux/macOS users

curl -fsSL https://raw.githubusercontent.com/mozilla-ai/encoderfile/main/install.sh | sh

• Build from source - Required for Windows, or for latest development features

  • See our guide on building encoderfile CLI from source

• Docker - Best for CI/CD or isolated builds without installing dependencies

  • Check out our guide on Building Encoderfiles with Docker

Python with Optimum

For exporting models to ONNX:

Requires Python 3.13+

pip install optimum[onnxruntime] onnxruntime

There are some resources that you can check about the ONNX runtime, what HF models it supports, and how to export a model in HF to this format:

• https://onnxruntime.ai/huggingface

• https://huggingface.co/docs/optimum-onnx/onnx/usage_guides/export_a_model

• https://huggingface.co/docs/transformers/serialization#onnx

Your First Encoderfile

Let's build a sentiment analysis model as an example.

Step 1: Export Model to ONNX

Export a HuggingFace model to ONNX format:

optimum-cli export onnx \
  --model distilbert-base-uncased-finetuned-sst-2-english \
  --task text-classification \
  ./sentiment-model

This creates a directory with the required files:

sentiment-model/
├── config.json
├── model.onnx                # ONNX weights
├── tokenizer.json            # Tokenizer
└── ... (other files)

Available task types:

• feature-extraction - For embedding models

• text-classification - For sequence classification

• token-classification - For NER/token tagging

Step 2: Create Configuration File

Create sentiment-config.yml:

encoderfile:
  name: sentiment-analyzer
  version: "1.0.0"
  path: ./sentiment-model
  model_type: sequence_classification
  output_path: ./build/sentiment-analyzer.encoderfile

Key fields:

• name - Model identifier (used in API responses)

• path - Path to the model directory with ONNX weights

• model_type - embedding, sequence_classification, or token_classification

• output_path - Where to output the binary (optional, defaults to ./<name>.encoderfile)

Step 3: Build the Binary

Build your encoderfile:

encoderfile build -f sentiment-config.yml

Note: If you built the CLI from source, use: ./target/release/encoderfile build -f sentiment-config.yml

The binary will be created at ./build/sentiment-analyzer.encoderfile.

Step 4: Run the Server

Start your encoderfile server:

chmod +x ./build/sentiment-analyzer.encoderfile
./build/sentiment-analyzer.encoderfile serve

You should see:

Starting HTTP server on 0.0.0.0:8080
Starting gRPC server on [::]:50051

Step 5: Make Predictions

Test with curl:

curl -X POST http://localhost:8080/predict \
  -H "Content-Type: application/json" \
  -d '{
    "inputs": [
      "This product is amazing!",
      "Terrible experience, very disappointed"
    ]
  }'

Expected response:

{
  "results": [
    {
      "logits": [-4.123, 4.567],
      "scores": [0.0001, 0.9999],
      "predicted_index": 1,
      "predicted_label": "POSITIVE"
    },
    {
      "logits": [4.234, -3.987],
      "scores": [0.9998, 0.0002],
      "predicted_index": 0,
      "predicted_label": "NEGATIVE"
    }
  ],
  "model_id": "sentiment-analyzer"
}

Quick Examples

Embedding Model

# Export
optimum-cli export onnx \
  --model sentence-transformers/all-MiniLM-L6-v2 \
  --task feature-extraction \
  ./embedding-model

# Config
cat > embedding-config.yml <<EOF
encoderfile:
  name: embedder
  path: ./embedding-model
  model_type: embedding
  output_path: ./build/embedder.encoderfile
EOF

# Build
encoderfile build -f embedding-config.yml

# Run
./build/embedder.encoderfile serve

Token Classification (NER)

# Export
optimum-cli export onnx \
  --model dslim/bert-base-NER \
  --task token-classification \
  ./ner-model

# Config
cat > ner-config.yml <<EOF
encoderfile:
  name: ner
  path: ./ner-model
  model_type: token_classification
  output_path: ./build/ner.encoderfile
EOF

# Build
encoderfile build -f ner-config.yml

# Run
./build/ner.encoderfile serve

Common Tasks

Server Configuration

Custom ports:

./build/my-model.encoderfile serve --http-port 3000 --grpc-port 50052

HTTP only (disable gRPC):

./build/my-model.encoderfile serve --disable-grpc

gRPC only (disable HTTP):

./build/my-model.encoderfile serve --disable-http

CLI Inference

Run inference without starting a server:

# Single input
./build/my-model.encoderfile infer "Test sentence"

# Multiple inputs
./build/my-model.encoderfile infer "First" "Second" "Third"

# Save to file
./build/my-model.encoderfile infer "Test" -o results.json

Using Pre-Exported Models

Some HuggingFace models already have ONNX weights:

# Clone model with existing ONNX weights
git clone https://huggingface.co/optimum/distilbert-base-uncased-finetuned-sst-2-english

# Build directly
cat > config.yml <<EOF
encoderfile:
  name: sentiment
  path: ./distilbert-base-uncased-finetuned-sst-2-english
  model_type: sequence_classification
  output_path: ./build/sentiment.encoderfile
EOF

encoderfile build -f config.yml

Troubleshooting

ONNX Export Fails

• Check model compatibility (must be encoder-only)

• Try a different task type

• Check the model's HuggingFace page for known issues

Build Fails

• Ensure the model directory has model.onnx, tokenizer.json, and config.json

• Verify the model type matches the architecture

• See our guide on building for detailed troubleshooting

Server Won't Start

• Check if ports are already in use

• Try different ports with --http-port and --grpc-port

• Check file permissions: chmod +x ./build/my-model.encoderfile

Inference Errors

• Check input format matches the expected schema

• Verify the server is running

• Check server logs for error messages

Next Steps

• Guide on building - Complete build guide with advanced configuration options

• CLI Reference - Full command-line documentation

• API Reference - REST, gRPC, and MCP API documentation

• Contributing - Help improve encoderfile