Api: Add ban_eos_token and add_bos_token support

Adds the ability for the client to specify whether to add the BOS
token and ban the EOS token.

Signed-off-by: kingbri <bdashore3@proton.me>

model.py

@@ -200,7 +200,8 @@ class ModelContainer:
         if text:
             # Assume token encoding
             return self.tokenizer.encode(
-                text, add_bos = kwargs.get("add_bos", True),
+                text,
+                add_bos = kwargs.get("add_bos_token", True),
                 encode_special_tokens = kwargs.get("encode_special_tokens", True)
             )
         if ids:
@@ -236,6 +237,8 @@ class ModelContainer:
                 'repetition_decay' (int): Repetition penalty range (default: same as range)
                 'stop' (list): List of stop strings/tokens to end response (default: [EOS])
                 'max_tokens' (int): Max no. tokens in response (default: 150)
+                'add_bos_token' (bool): Adds the BOS token to the start of the prompt (default: True)
+                'ban_eos_token' (bool): Bans the EOS token from generation (default: False)
                 'stream_interval' (float): Interval in seconds between each output chunk (default: immediate)
                 'generate_window' (int): Space to reserve at the end of the model's context when generating.
                     Rolls context window by the same amount if context length is exceeded to allow generating past
@@ -266,6 +269,10 @@ class ModelContainer:
         gen_settings.token_repetition_range = kwargs.get("repetition_range", self.config.max_seq_len)
         gen_settings.token_repetition_decay = kwargs.get("repetition_decay", gen_settings.token_repetition_range)
 
+        # Ban the EOS token if specified
+        if kwargs.get("ban_eos_token", False):
+            gen_settings.disallow_tokens(self.tokenizer, [self.tokenizer.eos_token_id])
+
         # Override sampler settings for temp = 0
 
         if gen_settings.temperature == 0:
@@ -280,7 +287,11 @@ class ModelContainer:
 
         # Tokenized context
 
-        ids = self.tokenizer.encode(prompt, encode_special_tokens = True)
+        ids = self.tokenizer.encode(
+            prompt,
+            add_bos=kwargs.get("add_bos_token", True),
+            encode_special_tokens = True
+        )
 
         # Begin