Create app.py

app.py

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+import gradio as gr
+import lightning
+import numpy as np
+import os
+import pandas as pd
+import timm
+import torch
+import torch.nn as nn
+
+from torch.utils.data import Dataset, DataLoader
+
+BACKBONE = "resnet18d"
+IMAGE_HEIGHT, IMAGE_WIDTH = 512, 512
+
+trained_weights_path = "epoch=009.ckpt"
+trained_weights = torch.load(trained_weights_path, map_location=torch.device('cpu'))["state_dict"]
+
+# recreate the model
+class BoneAgeModel(lightning.LightningModule):
+
+  def __init__(self, net, optimizer, scheduler, loss_fn):
+    super().__init__()
+    self.net = net
+    self.optimizer = optimizer
+    self.scheduler = scheduler
+    self.loss_fn = loss_fn
+
+    self.val_losses = []
+
+  def training_step(self, batch, batch_index):
+    out = self.net(batch["x"])
+    loss = self.loss_fn(out, batch["y"])
+    return loss
+
+  def validation_step(self, batch, batch_index):
+    out = self.net(batch["x"])
+    loss = self.loss_fn(out, batch["y"])
+    self.val_losses.append(loss.item())
+
+  def on_validation_epoch_end(self, *args, **kwargs):
+    val_loss = np.mean(self.val_losses)
+    self.val_losses = []
+    print(f"Validation Loss : {val_loss:0.3f}")
+
+  def configure_optimizers(self):
+    lr_scheduler = {"scheduler": self.scheduler, "interval": "step"}
+    return {"optimizer": self.optimizer, "lr_scheduler": lr_scheduler}
+
+net = timm.create_model(BACKBONE, pretrained=True, in_chans=1, num_classes=1)
+trained_model = BoneAgeModel(net, None, None, None)
+trained_model.load_state_dict(trained_weights)
+trained_model.eval()
+
+
+def predict_bone_age(Radiograph):
+  img = torch.from_numpy(Radiograph)
+  img = img.unsqueeze(0).unsqueeze(0) # add channel and batch dimensions
+  img = img / 255. # use same normalization as in the PyTorch dataset
+  with torch.inference_mode():
+    bone_age = trained_model.net(img)[0].item()
+  years = int(bone_age)
+  months = round((bone_age - years) * 12)
+  return f"Predicted Bone Age: {years} years, {months} months"
+
+
+image = gr.Image(height=IMAGE_HEIGHT, width=IMAGE_WIDTH, image_mode="L") # L for grayscale
+label = gr.Label(show_label=True, label="Bone Age Prediction")
+
+demo = gr.Interface(fn=predict_bone_age,
+                    inputs=[image],
+                    outputs=label)
+
+demo.launch(debug=True)