[APP] Android RPC

[yzhliu]

• Build android JNI automatically
• OpenCL support & test
• Build & sign .apk
• Generate android .o & .so in python (seems that we can simply re-use tvm.contrib.cc.create_shared)
• reconnect when rpc session ends
• android rpc UT & Instrumentation test (integration test by apps/android_rpc/tests/android_rpc_test.py)

Tested on my Redmi 4X Android Phone:
Processor: AArch64 Processor rev 4 (aarch64)
GLES: Qualcomm, Adreno (TM) 505, OpenGL ES 3.1 V@145.0 (GIT@Iebe23be877)

$ python3 android_rpc_test.py 
TVM: Initializing cython mode...
[00:38:20] src/codegen/llvm/codegen_llvm.cc:75: set native vector to be 32 for target aarch64
[00:38:20] src/runtime/opencl/opencl_device_api.cc:194: Initialize OpenCL platform 'Apple'
[00:38:20] src/runtime/opencl/opencl_device_api.cc:214: opencl(0)='Iris' cl_device_id=0x1024500
[00:38:21] src/codegen/llvm/codegen_llvm.cc:75: set native vector to be 32 for target aarch64
Run GPU test ...
0.000150427 secs/op
Run CPU test ...
0.000331302 secs/op

[tqchen]

Rpc->RPC

[tqchen]

Maybe it is easier to create a ndk.py to do the actual cross compile to android? We can bundle quite a lot of things into it, like default compiler search.

[yzhliu]

Yes, I created one. forgot to commit.

[tqchen]

since there is not too much reuse, maybe it is simpler to put the logics in ndk.py and not call create_shared here

[yzhliu]

@tqchen Ready to merge.
I'll provide documents in another PR (and java runtime documents)

[tqchen]

List of str, optional