langchain

9525e392 - community[patch]: Invoke callback prior to yielding token (pai_eas_endpoint) (#18627)

community[patch]: Invoke callback prior to yielding token (pai_eas_endpoint) (#18627) ## PR title community[patch]: Invoke callback prior to yielding token ## PR message - Description: Invoke callback prior to yielding token in _stream_ method in llms/pai_eas_endpoint. - Issue: #16913 - Dependencies: None