[Bugfix] Use random seed if seed is -1

[sasha0552]

AFAIK, OpenAI allows you to specify -1 to use random seed.

I haven't tested this because I don't have access to their API, but:

1. The application I am using uses -1 as a random seed and does not allow you to exclude the seed field.
2. The OpenAI-compatible server implementation I know of (llama.cpp) allows -1 to be used as a random seed.

[simon-mo]

confirming this behavior with openai

(base) ➜  ~ curl https://api.openai.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -d '{
    "model": "gpt-4-turbo", "seed": 1,
    "messages": [
      {
        "role": "system",
        "content": "You are a helpful assistant."
      },
      {
        "role": "user",
        "content": "Generate a number!"
      }
    ]
  }'
{
  "id": "chatcmpl-9K8DYBaq9ywPOwl6ys5O7xLbA9tWg",
  "object": "chat.completion",
  "created": 1714585176,
  "model": "gpt-4-turbo-2024-04-09",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "Sure! Here is a random number: 453"
      },
      "logprobs": null,
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 21,
    "completion_tokens": 10,
    "total_tokens": 31
  },
  "system_fingerprint": "fp_ea6eb70039"
}
(base) ➜  ~ curl https://api.openai.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -d '{
    "model": "gpt-4-turbo", "seed": 1,
    "messages": [
      {
        "role": "system",
        "content": "You are a helpful assistant."
      },
      {
        "role": "user",
        "content": "Generate a number!"
      }
    ]
  }'
{
  "id": "chatcmpl-9K8Dap5ALdZPUpmeF4MdbWUkoz4L0",
  "object": "chat.completion",
  "created": 1714585178,
  "model": "gpt-4-turbo-2024-04-09",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "Sure! Here is a random number: 453"
      },
      "logprobs": null,
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 21,
    "completion_tokens": 10,
    "total_tokens": 31
  },
  "system_fingerprint": "fp_46a93fa712"
}
(base) ➜  ~ curl https://api.openai.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -d '{
    "model": "gpt-4-turbo", "seed": -1,
    "messages": [
      {
        "role": "system",
        "content": "You are a helpful assistant."
      },
      {
        "role": "user",
        "content": "Generate a number!"
      }
    ]
  }'
{
  "id": "chatcmpl-9K8DgE5KkC27o9wEiU9eKfXqSVHLj",
  "object": "chat.completion",
  "created": 1714585184,
  "model": "gpt-4-turbo-2024-04-09",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "Sure! Here's a random number: 52"
      },
      "logprobs": null,
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 21,
    "completion_tokens": 10,
    "total_tokens": 31
  },
  "system_fingerprint": "fp_ea6eb70039"
}
(base) ➜  ~ curl https://api.openai.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -d '{
    "model": "gpt-4-turbo", "seed": -1,
    "messages": [
      {
        "role": "system",
        "content": "You are a helpful assistant."
      },
      {
        "role": "user",
        "content": "Generate a number!"
      }
    ]
  }'
{
  "id": "chatcmpl-9K8DnmTTigpuaXjByPNIkb6Eci0in",
  "object": "chat.completion",
  "created": 1714585191,
  "model": "gpt-4-turbo-2024-04-09",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "Sure! Here's a random number: **37**."
      },
      "logprobs": null,
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 21,
    "completion_tokens": 12,
    "total_tokens": 33
  },
  "system_fingerprint": "fp_3450ce39d5"
}