[Fix][Grammar] Detach token table to prevent disposing it #571
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Prior to this PR, when reusing the same engine but for different schema will run into error "Module has already been disposed". An example to reproduce this is included in #560.
This is because
this.tokenTable
is atvmjs.TVMObject
and will be disposed after the scope ends.We fix this by wrapping the call with
this.tvm.detachFromCurrentScope()
, and only disposethis.tokenTable
when we dispose the entireLLMChatPipeline
.