warnings: tokinizer_info and runtimeStatsTest()

[hpssjellis]

These two warnings are showing up. Has anyone @CharlieFRuan seen them before? I messed around with ChatCompletion.usage instead of runtimeStatsTest() but could not get it working.

My typically working demo is at https://hpssjellis.github.io/my-examples-of-ai-agents/public/web-llm/web-llm00.html

llm_chat.ts:165 Cannot find tokenizer_info or token_table_postproc_method in mlc-chat-config.json, using default token_postproc_method raw.
This field is only used for json mode.

engine.ts:1274 WARNING: runtimeStatsText() will soon be deprecated. Please use ChatCompletion.usage for non-streaming requests, or ChatCompletionChunk.usage for streaming requests, enabled by stream_options. The only flow that expects to use runtimeStatsText() as of now is forwardTokensAndSample().