“9b3c9643419335adb59d51ac5ca1dd19681d5420”上不存在“...fluid/operators/git@gitcode.net:Crayonxin2000/Paddle.git”
* Add documentation of cross-compiling for iOS. * Correst the typo in documentation of cross-compiling for raspberry pi. * Set ANDROID_API to 21 when it is specified < 21 for arm64-v8a in build_android.sh. * Check the input and print the usage in MergeModel.cpp.