implmente save/load, eval structure

DataLoader.py

@@ -2,6 +2,7 @@ import glob
 import os
 
 import numpy as np
+import torch.utils.data.dataset
 from PIL import Image
 from torch.utils.data import Dataset
 from torch.utils.data import DataLoader
@@ -27,5 +28,22 @@ class ImageDataset(Dataset):
 
 def get_image_loader(path: str):
     image_dataset = ImageDataset(path)
-    image_loader = DataLoader(image_dataset, shuffle=True, batch_size=10)
-    return image_loader
+    totlen = len(image_dataset)
+    trains, tests = torch.utils.data.dataset.random_split(image_dataset, (int(totlen * .7), totlen - int(totlen * .7)),
+                                                          generator=torch.Generator().manual_seed(42))
+
+    train_loader = DataLoader(
+        trains,
+        shuffle=True,  # shuffle the order of our samples
+        batch_size=4,  # stack 4 samples to a minibatch
+        num_workers=0  # no background workers (see comment below)
+    )
+
+    test_loader = DataLoader(
+        tsts,
+        shuffle=True,  # shuffle the order of our samples
+        batch_size=4,  # stack 4 samples to a minibatch
+        num_workers=0  # no background workers (see comment below)
+    )
+
+    return train_loader, test_loader

ImageImpaint.py

@@ -4,19 +4,23 @@ from DataLoader import get_image_loader
 from Net import ImageNN
 
 
+# 01.05.22 -- 0.5h
+from netio import save_model, load_model
+
+
 def train_model():
-    image_loader = get_image_loader("my/supercool/image/dir")
-    # todo split to train and test (maybe evaluation sets)
+    train_loader, test_loader = get_image_loader("my/supercool/image/dir")
     nn = ImageNN()  # todo pass size ason.
+    nn.train()  # init with train mode
 
     optimizer = torch.optim.SGD(nn.parameters(), lr=0.1)  # todo adjust parameters and lr
     loss_function = torch.nn.CrossEntropyLoss()
     n_epochs = 15  # todo epcchs here
 
-    # Training
     losses = []
     for epoch in range(n_epochs):
-        for input_tensor, target_tensor in image_loader:
+        print(f"Epoch {epoch}/{n_epochs}\n")
+        for input_tensor, target_tensor in train_loader:
             output = nn(input_tensor)  # get model output (forward pass)
             loss = loss_function(output, target_tensor)  # compute loss given model output and true target
             loss.backward()  # compute gradients (backward pass)
@@ -24,9 +28,21 @@ def train_model():
             optimizer.zero_grad()  # reset gradients
             losses.append(loss.item())
 
-    # todo evaluate trained model
+    # switch net to eval mode
+    nn.eval()
+    with torch.no_grad():
+        for input_tensor, target_tensor in test_loader:
+            # iterate testloader and we have to decide somhow now the goodness of the prediction
+            out = nn(input_tensor)  # apply model
+
+            diff = out - target_tensor
+        # todo evaluate trained model on testset loader
+
     # todo save trained model to blob file
+    save_model(nn)
 
 
 def apply_model():
+    model = load_model()
+
     pass

netio.py

@@ -0,0 +1,14 @@
+import torch
+
+from Net import ImageNN
+
+
+def save_model(model: torch.nn.Module):
+    torch.save(model.state_dict(), 'impaintmodel.pth')
+
+
+def load_model():
+    model = ImageNN()
+    model.load_state_dict(torch.load('model_weights.pth'))
+    model.eval()
+    return model