fix: cgan discriminator repeated label (#101)

Author: fabclmnt

examples/regular/cgan_example.py

@@ -25,7 +25,7 @@
 train_data = data.loc[ data['Class']==1 ].copy()
 
 #Create a new class column using KMeans - This will mainly be useful if we want to leverage conditional GAN
-print("Dataset info: Number of records - {} Number of varibles - {}".format(train_data.shape[0], train_data.shape[1]))
+print("Dataset info: Number of records - {} Number of variables - {}".format(train_data.shape[0], train_data.shape[1]))
 algorithm = cluster.KMeans
 args, kwds = (), {'n_clusters':2, 'random_state':0}
 labels = algorithm(*args, **kwds).fit_predict(train_data[ data_cols ])
@@ -63,7 +63,7 @@
                            lr=learning_rate,
                            betas=(beta_1, beta_2),
                            noise_dim=noise_dim,
-                           n_cols=train_sample.shape[1],
+                           n_cols=train_sample.shape[1] - len(label_cols),  # Don't count the label columns here
                            layers_dim=dim)
 
 train_args = TrainParameters(epochs=epochs,

src/ydata_synthetic/synthesizers/regular/cgan/model.py

@@ -93,14 +93,15 @@ def train(self, data: Union[DataFrame, array],
                 # ---------------------
                 batch_x = self.get_data_batch(data, self.batch_size)
                 label = batch_x[:, train_arguments.label_dim]
+                data_cols = [i for i in range(batch_x.shape[1] - 1)]  # All data without the label columns
                 noise = tf.random.normal((self.batch_size, self.noise_dim))
 
                 # Generate a batch of new records
                 gen_records = self.generator([noise, label], training=True)
 
                 # Train the discriminator
-                d_loss_real = self.discriminator.train_on_batch([batch_x, label], valid)
-                d_loss_fake = self.discriminator.train_on_batch([gen_records, label], fake)
+                d_loss_real = self.discriminator.train_on_batch([batch_x[:, data_cols], label], valid)  # Separate labels
+                d_loss_fake = self.discriminator.train_on_batch([gen_records, label], fake)  # Separate labels
                 d_loss = 0.5 * np.add(d_loss_real, d_loss_fake)
 
                 # ---------------------