It's me again...
I solved my previous problem with AMD HD6950 OpenCL drivers. Now I tried to use plaidml as a keras backend on Jupyter Notebook. When i try to import backend i get:

`os.environ["KERAS_BACKEND"] = "plaidml.keras.backend"
os.environ["PLAIDML_DEVICE_IDS"] = " opencl_amd_cayman.0

import plaidml.keras
plaidml.keras.install_backend()
`
opencl_amd_cayman line was optional I tried without it and result was the same...

PlaidMLError: No devices found. Please run plaidml-setup. The following devices are available:
b'llvm_cpu.0'
b'opencl_cpu.0'

When I start tests in terminal as a:
plaidbench keras mobilenet

Everything works fine!