fix: bad type hint and typo for forward method return value

autoencoder.py

@@ -143,7 +143,7 @@ class VariationalAutoencoder(AAutoencoder):
         return data.item()
 
     def train(self, v: np.ndarray) -> float:
-        out = self.forward(v)
+        out, _ = self.forward(v)
         error = out - v
         self.encoder.backprop(
             self.sampler.backprop(
@@ -152,7 +152,7 @@ class VariationalAutoencoder(AAutoencoder):
         )
         return np.sum(np.abs(error)) / len(v)
 
-    def forward(self, v: np.ndarray) -> np.ndarray:
+    def forward(self, v: np.ndarray) -> tuple[np.ndarray, np.ndarray]:
         code = self.encoder.forward(v)
         sample = self.sampler.forward(code)
         out = self.decoder.forward(sample)

mnist_test.py

@@ -29,7 +29,6 @@ def mnist_train(
     x_test.resize(x_test.shape[0], in_len)
     x_train = x_train / 255
     x_test = x_test / 255
-    x_train = x_train[:5000]
     if os.path.exists(filename):
         autoencoder = cls.load(filename)
     else: