Update phishing_email_detection_gpt2.py

Author: david-thrower

phishing_email_detection_gpt2.py

@@ -30,6 +30,8 @@
     import zero_7_exp_decay, zero_95_exp_decay, simple_sigmoid
 from ast import literal_eval
 
+from custom.custom import GPT2Layer
+
 #
 # Load the email data
 #
@@ -73,50 +75,8 @@
 INPUT_SHAPES  = [()]
 OUTPUT_SHAPES = [1]
 
-"""### A custom GPT2 encoder layer for text embedding"""
-
-class GPT2Layer(tf.keras.layers.Layer):
-
-    def __init__(self, max_seq_length, **kwargs):
-        #
-        super(GPT2Layer, self).__init__(**kwargs)
-        #
-        # Load the GPT2 tokenizer, preprocessor and model
-        self.tokenizer = GPT2Tokenizer.from_preset("gpt2_base_en")
-        self.preprocessor = GPT2Preprocessor(self.tokenizer,
-                                             sequence_length=max_seq_length)
-        self.encoder   = GPT2Backbone.from_preset("gpt2_base_en")
-        #
-        # Set whether the GPT2 model's layers are trainable
-        #self.encoder.trainable = False
-        for layer in self.encoder.layers:
-            layer.trainable = False
-        #
-        self.encoder.layers[-2].trainable = True
-        #
-        # Set the maximum sequence length for tokenization
-        self.max_seq_length = max_seq_length
-
-    def call(self, inputs):
-        #
-        # Output the GPT2 embedding
-        prep = self.preprocessor([inputs])
-        embedding  = self.encoder(prep)
-        avg_pool = tf.reduce_mean(embedding, axis=1)
-        #
-        return avg_pool
-
-    def get_config(self):
-        #
-        config = super(GPT2Layer, self).get_config()
-        config.update({'max_seq_length': self.max_seq_length})
-        #
-        return config
-
-    @classmethod
-    def from_config(cls, config):
-        #
-        return cls(max_seq_length=config['max_seq_length'])
+
+
 
 # GPT2 configurables
 max_seq_length = 96