Added chat template.

tokenizer_config.json

@@ -29,7 +29,7 @@
   },
   "additional_special_tokens": [],
   "bos_token": "<s>",
-  "chat_template": "{{ bos_token }}{% for message in messages %}{% if (message['role'] == 'user') != (loop.index0 % 2 == 0) %}{{ raise_exception('Conversation roles must alternate user/assistant/user/assistant/...') }}{% endif %}{% if message['role'] == 'user' %}{{ '[INST] ' + message['content'] + ' [/INST]' }}{% elif message['role'] == 'assistant' %}{{ message['content'] + eos_token}}{% else %}{{ raise_exception('Only user and assistant roles are supported!') }}{% endif %}{% endfor %}",
+  "chat_template": "{% set ns = namespace(found=false) %}{% for message in messages %}{% if message['role'] == 'system' %}{% set ns.found = true %}{% endif %}{% endfor %}{% if not ns.found %}{{ '### Instruction:\nYou are a chatbot.\n\n' }}{% endif %}{% for message in messages %}{% if message['role'] == 'system' %}{{ '### Instruction:\n' + message['content'] + '\n\n' }}{% else %}{% if message['role'] == 'user' %}{{ '### Input:\n' + message['content'] + '\n\n' }}{% else %}{{ '### Response:\n' + message['content'] + '\n\n' }}{% endif %}{% endif %}{% endfor %}{% if add_generation_prompt %}{{ '### Response:\n' }}{% endif %}",
   "clean_up_tokenization_spaces": false,
   "eos_token": "</s>",
   "legacy": true,