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import torch, torchvision |
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from torchvision import transforms |
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import numpy as np |
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import gradio as gr |
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from PIL import Image |
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from pytorch_grad_cam import GradCAM |
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from pytorch_grad_cam.utils.image import show_cam_on_image |
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from custom_resnet import Net |
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from PIL import Image |
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import io |
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model = Net('batch') |
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model.load_state_dict(torch.load("model.pth", map_location=torch.device('cpu')), strict=False) |
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classes = ('plane', 'car', 'bird', 'cat', 'deer', |
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'dog', 'frog', 'horse', 'ship', 'truck') |
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def inference(input_img_files, transparency = 0.5, target_layer_number = -1): |
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confidences_list = [] |
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visualizations_list = [] |
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for input_img_file in input_img_files: |
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with open(input_img_file.name, "rb") as f: |
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input_img = Image.open(io.BytesIO(f.read())).convert("RGB") |
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transform = transforms.ToTensor() |
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org_img = input_img |
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input_img = transform(input_img) |
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input_img = input_img.unsqueeze(0) |
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outputs = model(input_img) |
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softmax = torch.nn.Softmax(dim=0) |
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o = softmax(outputs.flatten()) |
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confidences = {classes[i]: float(o[i]) for i in range(10)} |
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confidences_list.append(confidences) |
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_, prediction = torch.max(outputs, 1) |
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target_layers = [model.layer2[target_layer_number]] |
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cam = GradCAM(model=model, target_layers=target_layers, use_cuda=False) |
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grayscale_cam = cam(input_tensor=input_img, targets=None) |
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grayscale_cam = grayscale_cam[0, :] |
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img = input_img.squeeze(0) |
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rgb_img = np.transpose(img, (1, 2, 0)) |
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rgb_img = rgb_img.numpy() |
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visualization = show_cam_on_image(org_img/255, grayscale_cam, use_rgb=True, image_weight=transparency) |
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visualizations_list.append(visualization) |
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return confidences_list, visualizations_list |
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title = "CIFAR10 trained on ResNet18 Model with GradCAM" |
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description = "A simple Gradio interface to infer on ResNet model, and get GradCAM results" |
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examples = [["cat.png", 0.5, -1],["dog.png", 0.5, -1]] |
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demo = gr.Interface( |
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inference, |
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inputs=[ |
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gr.inputs.File(file_count="multiple"), |
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gr.Slider(0, 1, value=0.5, label="Opacity of GradCAM"), |
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gr.Slider(-2, -1, value=-2, step=1, label="Which Layer?") |
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], |
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outputs = [gr.Label(num_top_classes=3), gr.Image(shape=(32, 32), label="Output", style={"width": "128px", "height": "128px"})], |
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title=title, |
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description=description, |
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examples=examples, |
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) |
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demo.launch() |
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