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| import gradio as gr | |
| import numpy as np | |
| import json | |
| import os | |
| from PIL import Image | |
| import onnxruntime as rt | |
| class ONNXModel: | |
| def __init__(self, dir_path) -> None: | |
| """Method to get name of model file. Assumes model is in the parent directory for script.""" | |
| model_dir = os.path.dirname(dir_path) | |
| with open(os.path.join(model_dir, "signature.json"), "r") as f: | |
| self.signature = json.load(f) | |
| self.model_file = os.path.join(model_dir, self.signature.get("filename")) | |
| if not os.path.isfile(self.model_file): | |
| raise FileNotFoundError(f"Model file does not exist") | |
| # get the signature for model inputs and outputs | |
| self.signature_inputs = self.signature.get("inputs") | |
| self.signature_outputs = self.signature.get("outputs") | |
| self.session = None | |
| if "Image" not in self.signature_inputs: | |
| raise ValueError("ONNX model doesn't have 'Image' input! Check signature.json, and please report issue to Lobe.") | |
| # Look for the version in signature file. | |
| # If it's not found or the doesn't match expected, print a message | |
| version = self.signature.get("export_model_version") | |
| if version is None or version != EXPORT_MODEL_VERSION: | |
| print( | |
| f"There has been a change to the model format. Please use a model with a signature 'export_model_version' that matches {EXPORT_MODEL_VERSION}." | |
| ) | |
| def load(self) -> None: | |
| """Load the model from path to model file""" | |
| # Load ONNX model as session. | |
| self.session = rt.InferenceSession(path_or_bytes=self.model_file) | |
| def predict(self, image: Image.Image) -> dict: | |
| """ | |
| Predict with the ONNX session! | |
| """ | |
| # process image to be compatible with the model | |
| img = self.process_image(image, self.signature_inputs.get("Image").get("shape")) | |
| # run the model! | |
| fetches = [(key, value.get("name")) for key, value in self.signature_outputs.items()] | |
| # make the image a batch of 1 | |
| feed = {self.signature_inputs.get("Image").get("name"): [img]} | |
| outputs = self.session.run(output_names=[name for (_, name) in fetches], input_feed=feed) | |
| return self.process_output(fetches, outputs) | |
| def process_image(self, image: Image.Image, input_shape: list) -> np.ndarray: | |
| """ | |
| Given a PIL Image, center square crop and resize to fit the expected model input, and convert from [0,255] to [0,1] values. | |
| """ | |
| width, height = image.size | |
| # ensure image type is compatible with model and convert if not | |
| if image.mode != "RGB": | |
| image = image.convert("RGB") | |
| # center crop image (you can substitute any other method to make a square image, such as just resizing or padding edges with 0) | |
| if width != height: | |
| square_size = min(width, height) | |
| left = (width - square_size) / 2 | |
| top = (height - square_size) / 2 | |
| right = (width + square_size) / 2 | |
| bottom = (height + square_size) / 2 | |
| # Crop the center of the image | |
| image = image.crop((left, top, right, bottom)) | |
| # now the image is square, resize it to be the right shape for the model input | |
| input_width, input_height = input_shape[1:3] | |
| if image.width != input_width or image.height != input_height: | |
| image = image.resize((input_width, input_height)) | |
| # make 0-1 float instead of 0-255 int (that PIL Image loads by default) | |
| image = np.asarray(image) / 255.0 | |
| # format input as model expects | |
| return image.astype(np.float32) | |
| def process_output(self, fetches: dict, outputs: dict) -> dict: | |
| # un-batch since we ran an image with batch size of 1, | |
| # convert to normal python types with tolist(), and convert any byte strings to normal strings with .decode() | |
| out_keys = ["label", "confidence"] | |
| results = {} | |
| for i, (key, _) in enumerate(fetches): | |
| val = outputs[i].tolist()[0] | |
| if isinstance(val, bytes): | |
| val = val.decode() | |
| results[key] = val | |
| confs = results["Confidences"] | |
| labels = self.signature.get("classes").get("Label") | |
| output = [dict(zip(out_keys, group)) for group in zip(labels, confs)] | |
| sorted_output = {"predictions": sorted(output, key=lambda k: k["confidence"], reverse=True)} | |
| return sorted_output | |
| EXPORT_MODEL_VERSION=1 | |
| model = ONNXModel(dir_path="../model.onnx") | |
| model.load() | |
| def predict(image): | |
| image = Image.fromarray(np.uint8(image), 'RGB') | |
| prediction = model.predict(image) | |
| for output in prediction["predictions"]: | |
| output["confidence"] = round(output["confidence"], 2) | |
| return prediction | |
| inputs = gr.inputs.Image(type="pil") | |
| outputs = gr.outputs.JSON() | |
| gr.Interface(fn=predict, inputs=inputs, outputs=outputs).launch() |