Removed obsolete constant N_CLASSES

Signed-off-by: Jim Martens <github@2martens.de>

src/twomartens/masterthesis/ssd.py

@@ -17,9 +17,6 @@
 """
 Provides functionality to use the SSD Keras implementation.
 
-Attributes:
-    N_CLASSES: number of known classes (without background)
-    
 Functions:
     compile_model(...): compiles an SSD model
     get_loss_func(...): returns the SSD loss function
@@ -45,8 +42,6 @@ from twomartens.masterthesis.ssd_keras.ssd_encoder_decoder import ssd_output_dec
 K = tf.keras.backend
 tfe = tf.contrib.eager
 
-N_CLASSES = 80
-
 
 def get_model(use_dropout: bool,
               dropout_model: callable, vanilla_model: callable,