BUG: model_uri converts symlink in cache to CamelCase case automatically resuling in a wrong path to directory or file

[vikrantrathore]

Describe the bug

I registered a custom model named test-llama-3-instruct which was already present in my directory using xinference register. After registration when the model is launched using xinference launch. It throws an error at

inference/xinference/model/llm/llm_family.py

Line 383 in cb9dbb2

os.symlink(src_root, cache_dir, target_is_directory=True)

After diagnosis found that URI is creating the wrong symlink. Instead of /home/ubuntu/projects/llm/LLaMA/Meta-Llama-3-8B-Instruct, it creates a symlink to /home/ubuntu/projects/llm/LLaMa/Meta-Llama-3-8B-Instruct", so the program to register the model creates a wrong cache link and coverts LLaMA in URI to camelcase LLaMa probably its an error in logic. Its a very subtle bug and took me long to figure out,but the problem can be fixed if I update the symlink. Now will try to see if can fix the code and create a PR, but its a trivial change so probably core developer can do it.

{
    "version": 1,
    "context_length": 8192,
    "model_name": "test-llama-3-instruct",
    "model_lang": [
	"en"
    ],
    "model_ability": [
	"chat"
    ],
    "model_description": "Llama 3 is an auto-regressive language model that uses an optimized transformer architecture",
    "model_family": "llama-3-instruct",
    "model_specs": [
	{
	    "model_format": "pytorch",
	    "model_size_in_billions": 8,
	    "quantizations": [
		"4-bit",
		"8-bit",
		"none"
	    ],
	    "model_id": "test-llama-3-instruct",
	    "model_uri": "file:///home/ubuntu/projects/llm/LLaMA/Meta-Llama-3-8B-Instruct"
	}],
    "prompt_style": {
	"style_name": "LLAMA3",
	"system_prompt": "You are a helpful assistant.",
	"roles": [
	    "user",
	    "assistant"
	],
	"intra_message_sep": "\n\n",
	"inter_message_sep": "<|eot_id|>",
	"stop_token_ids": [
	    128001,
	    128009
	],
	"stop": [
	    "<|end_of_text|>",
	    "<|eot_id|>"
	]
    }
}

To Reproduce

Just use the given custom_model.json file to register the model and try to launch the inference model.

1. Your Python version.
   3.11.3

2. The version of xinference you use.
   Commit: cb9dbb2

Expected behavior

It should not change the directory path to CamelCase should take it as is.

Additional context

None