label-studio-yolov8-backend

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Before using this repository!

The labels in model.py are specific to my project, so please replace them with your own labels and add your trained model weights best.pt into the same directory with model.py. Also remember to copy/update the contents of your .env file to include the variables defined in .env.example. (:

Quickstart

Build and start Machine Learning backend on http://localhost:9090

docker-compose up

Check if it works:

$ curl http://localhost:9090/health
{"status":"UP"}

Then connect running backend to Label Studio using Machine Learning settings.

Writing your own model

1. Place your scripts for model training & inference inside root directory. Follow the API guidelines described bellow. You can put everything in a single file, or create 2 separate one say my_training_module.py and my_inference_module.py

2. Write down your python dependencies in requirements.txt

3. Open wsgi.py and make your configurations under init_model_server arguments:

   from my_training_module import training_script
   from my_inference_module import InferenceModel
   
   init_model_server(
       create_model_func=InferenceModel,
       train_script=training_script,
       ...
   

4. Make sure you have docker & docker-compose installed on your system, then run

   docker-compose up --build
   

API guidelines

Inference module

In order to create module for inference, you have to declare the following class:

from htx.base_model import BaseModel

# use BaseModel inheritance provided by pyheartex SDK 
class MyModel(BaseModel):
    
    # Describe input types (Label Studio object tags names)
    INPUT_TYPES = ('Image',)

    # Describe output types (Label Studio control tags names)
    INPUT_TYPES = ('Choices',)

    def load(self, resources, **kwargs):
        """Here you load the model into the memory. resources is a dict returned by training script"""
        self.model_path = resources["model_path"]
        self.labels = resources["labels"]

    def predict(self, tasks, **kwargs):
        """Here you create list of model results with Label Studio's prediction format, task by task"""
        predictions = []
        for task in tasks:
            # do inference...
            predictions.append(task_prediction)
        return predictions

Training module

Training could be made in a separate environment. The only one convention is that data iterator and working directory are specified as input arguments for training function which outputs JSON-serializable resources consumed later by load() function in inference module.

def train(input_iterator, working_dir, **kwargs):
    """Here you gather input examples and output labels and train your model"""
    resources = {"model_path": "some/model/path", "labels": ["aaa", "bbb", "ccc"]}
    return resources