Update main's interactive mode to use the chat handshake templates support already available in llama.cpp (and currently only used by server,...)

[hanishkvc]

Currently the interactive mode of main doesnt add any tags to identify system or user messages to the model, by default.

One will have to either

• use the seperate chatml mode to specifically work with chatml supported models.
• or pass in-prefix, in-suffix and reverse-prompt arguments as required to try and match the required chatting template.

This PR tries to add a generic chat mode to main, which can make use of any chat templates already added to llama_chat_apply_template_internal, which is currently used by server logic, but not main logic.

To help with the same a new chaton.hpp file is added to common, which contains

• llama_chat_apply_template_simple, which is a wrapper around llama_chat_apply_template(inturn internal) of lama.cpp
• llama_chat_reverse_prompt which helps add any needed reverse prompts for the requested template standard

To add new chat handshake templates remember to add needed logic to

• llama_chat_apply_template_internal (llama.cpp) and
• llama_chat_reverse_prompt (common/chaton.hpp)

To use this support pass -i and --chaton TEMPLATE_ID to main.
Currently supported templates is chatml and llama2, for other chat handshake template standards already support by chat_apply_template_internal, suitable reverse prompts need to be added to llama_chat_reverse_prompt.

[hanishkvc]

Adding this attached patch to this PR, allows me to chat with llama3 also using main -i --chaton llama3

llamacpp-llama3-exp-v1.patch

[DifferentialityDevelopment]

This sounds like an excellent and much needed addition to main.
Did you add a flag for specifying the system roles message?

[ngxson]

I've made a detailed research on the same subject, so I strongly recommend you to refer to this issue: #6391

Also, a new function named llama_token_is_eog will be introduced with llama3 in the other PR, so it's better to wait

[hanishkvc]

This sounds like an excellent and much needed addition to main. Did you add a flag for specifying the system roles message?

In interactive mode (ie -i) any prompt file (-f) or prompt (-p) passed using the command line argument is treated as a system prompt and inturn this PR formats it to match the system prompt template expected.

[arch-btw]

Here's the patch running llama3 with --verbose-prompt. I think there might be too many new lines?

main: prompt: '<|start_header_id|>system<|end_header_id|>
You are an assistant
<|eot_id|>

'
main: number of tokens in prompt = 11
128006 -> ''
  9125 -> 'system'
128007 -> ''
   198 -> '
'
  2675 -> 'You'
   527 -> ' are'
   459 -> ' an'
 18328 -> ' assistant'
   198 -> '
'
128009 -> ''
   271 -> '

'
main: static prompt based on n_keep: 'system
You are an assistant


'

main: interactive mode on.
Reverse prompt: '<|eot_id|>'
128009 -> ''

Without --verbose-prompt:

system
You are an assistant



> 

[hanishkvc]

There is a new PR, which is again a experiment which tries to use a simple minded json file to try and drive the logic, so that many aspects can be controlled by editing the json file, rather than needed to update the code.

#6834