import cortex
​
class PythonPredictor:
    def __init__(self, config):
        from transformers import pipeline
        self.model = pipeline(task="text-generation")
​
    def predict(self, payload):
        return self.model(payload["text"])[0]
​
requirements = ["tensorflow", "transformers"]
​
api_spec_cpu = {
    "name": "text-generator-cpu",
    "kind": "RealtimeAPI",
    "compute": {
        "cpu": 1,
    },
}
​
api_spec_gpu = {
    "name": "text-generator-gpu",
    "kind": "RealtimeAPI",
    "compute": {
        "gpu": 1,
    },
}
​
cx = cortex.client("aws")
cx.create_api(api_spec_cpu, predictor=PythonPredictor, requirements=requirements)
cx.create_api(api_spec_gpu, predictor=PythonPredictor, requirements=requirements)

traffic_splitter_spec = {
    "name": "text-generator",
    "kind": "TrafficSplitter",
    "apis": [
        {"name": "text-generator-cpu", "weight": 50},
        {"name": "text-generator-gpu", "weight": 50},
    ],
}
​
cx.create_api(traffic_splitter_spec)

traffic_splitter_spec = cx.get_api("text-generator")["spec"]["submitted_api_spec"]
​
# send 99% of the traffic to text-generator-gpu
traffic_splitter_spec["apis"][0]["weight"] = 1
traffic_splitter_spec["apis"][1]["weight"] = 99
​
cx.patch(traffic_splitter_spec)