Error while running Tvm on Android with OpenCL

@tqchen

Am trying to run android rpc test script (https://github.com/dmlc/tvm/tree/master/apps/android_rpc) “Build with OpenCL” with my following environment with OpenCL enable in make/config.mk.

Environment : Laptop:: Description: Ubuntu 17.10 Release: 17.10 Target:: Huawei Mate 9 Mali G71 GPU

Error :

xxxxxxx@Dayananda:~/shared-windows7/nnvm/nnvm/tvm/apps/android_rpc$ python tests/android_rpc_test.py 
TVM: Initializing cython mode...
[16:03:39] src/runtime/opencl/opencl_device_api.cc:190: No OpenCL platform matched given existing options ...
Traceback (most recent call last):
  File "tests/android_rpc_test.py", line 75, in <module>
    test_rpc_module()
  File "tests/android_rpc_test.py", line 34, in test_rpc_module
    f = tvm.build(s, [A, B], "opencl", target_host=target, name="myadd")
  File "/home/xxxxxxx/.local/lib/python3.6/site-packages/tvm-0.2.0-py3.6-linux-x86_64.egg/tvm/build_module.py", line 449, in build
    mdev = codegen.build_module(fdevice, str(target_device))
  File "/home/xxxxxxx/.local/lib/python3.6/site-packages/tvm-0.2.0-py3.6-linux-x86_64.egg/tvm/codegen.py", line 20, in build_module
    return _Build(lowered_func, target)
  File "/home/xxxxxxx/.local/lib/python3.6/site-packages/tvm-0.2.0-py3.6-linux-x86_64.egg/tvm/_ffi/function.py", line 255, in my_api_func
    return flocal(*args)
  File "tvm/_ffi/_cython/./function.pxi", line 264, in core.FunctionBase.__call__
  File "tvm/_ffi/_cython/./function.pxi", line 213, in core.FuncCall
  File "tvm/_ffi/_cython/./function.pxi", line 205, in core.FuncCall3
  File "tvm/_ffi/_cython/./base.pxi", line 131, in core.CALL
tvm._ffi.base.TVMError: b'[16:03:39] src/runtime/opencl/opencl_module.cc:94: Check failed: workspace_->context != nullptr No OpenCL device

Note : For compilation success purpose libOpenCl.so is pointing with “/usr/lib/x86_64-linux-gnu/libOpenCL.so.1”

Questions::

1. How to resolve this problem?
2. “Build with OpenCL” tutorial i couldn’t find any much information related to OpenCl installation??
3. Why tvm.build is depending on host libOpenCl.so?

tvm.build with CPU is success but tvm.build with OPENCL is failure.

[li3cmz]

Please I don’t know how to link the opencl library for RK3288. “The cross compiled library: runs on your phone, this must be built with USE_OPENCL=1, and link to proper opencl library on your phone” Help

[siju-samuel]

Do we need to add topi compute and schedule in CPP to support for running in Android device with OpenCL? or the ones with python alone can work fine?