docs: Fix readme example

README.md

@@ -40,48 +40,60 @@ pip install -e .
 
 ```python
 import torch
-from simple_einet.distributions import RatNormal
+from simple_einet.layers.distributions.normal import Normal
 from simple_einet.einet import Einet
 from simple_einet.einet import EinetConfig
 
-torch.manual_seed(0)
 
-# Input dimensions
-in_features = 4
-batchsize = 5
-out_features = 3
+if __name__ == "__main__":
+    torch.manual_seed(0)
 
-# Create input sample
-x = torch.randn(batchsize, in_features)
+    # Input dimensions
+    in_features = 4
+    batchsize = 5
 
-# Construct Einet
-einet = Einet(EinetConfig(num_features=in_features, depth=2, num_sums=2, num_channels=1, num_leaves=3, num_repetitions=3, num_classes=out_features, dropout=0.0, leaf_type=Normal))
+    # Create input sample
+    x = torch.randn(batchsize, in_features)
 
-# Compute log-likelihoods
-lls = einet(x)
-print(f"lls.shape: {lls.shape}")
-print(f"lls: \n{lls}")
+    # Construct Einet
+    cfg = EinetConfig(
+        num_features=in_features,
+        depth=2,
+        num_sums=2,
+        num_channels=1,
+        num_leaves=3,
+        num_repetitions=3,
+        num_classes=1,
+        dropout=0.0,
+        leaf_type=Normal,
+    )
+    einet = Einet(cfg)
 
-# Optimize Einet parameters (weights and leaf params)
-optim = torch.optim.Adam(einet.parameters(), lr=0.001)
+    # Compute log-likelihoods
+    lls = einet(x)
+    print(f"lls.shape: {lls.shape}")
+    print(f"lls: \n{lls}")
 
-for _ in range(1000):
-    optim.zero_grad()
+    # Optimize Einet parameters (weights and leaf params)
+    optim = torch.optim.Adam(einet.parameters(), lr=0.001)
 
-    # Forward pass: compute log-likelihoods
-    lls = einet(x)
+    for _ in range(1000):
+        optim.zero_grad()
+
+        # Forward pass: compute log-likelihoods
+        lls = einet(x)
 
-    # Backprop negative log-likelihood loss
-    nlls = -1 * lls.sum()
-    nlls.backward()
+        # Backprop negative log-likelihood loss
+        nlls = -1 * lls.sum()
+        nlls.backward()
 
-    # Update weights
-    optim.step()
+        # Update weights
+        optim.step()
 
-# Construct samples
-samples = einet.sample(2)
-print(f"samples.shape: {samples.shape}")
-print(f"samples: \n{samples}")
+    # Construct samples
+    samples = einet.sample(2)
+    print(f"samples.shape: {samples.shape}")
+    print(f"samples: \n{samples}")
 ```
 
 ## Citing EinsumNetworks