“ca8541bd3d591e388e9052c87549dd53815a4743”上不存在“demo/audio_classification/train.py”
* 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.