* Set BIGDL_IMPORT_IPEX default to true, i.e., auto import IPEX for XPU.
* Remove import intel_extension_for_pytorch as ipex from GPU example.
* Add support for bigdl-core-xe-21.
* lora support and single card example
* support multi-card, refactor code
* fix model id and style
* remove torch patch, add two new class for bf16, update example
* fix style
* change to training_mode
* small fix
* add more info in help
* fixstyle, update readme
* fix ut
* fix ut
* Handling compatibility issues with default LoraConfig