ValueError: backend must be one of ('cpu', 'mkl')

[bin913]

# When I run every example, the following error always happened

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Warning: couldn't load settings file: ./ale.cfg
Game console created:
ROM file: roms/breakout.bin
Cart Name: Breakout - Breakaway IV (1978) (Atari)
Cart MD5: f34f08e5eb96e500e851a80be3277a56
Display Format: AUTO-DETECT ==> NTSC
ROM Size: 2048
Bankswitch Type: AUTO-DETECT ==> 2K

WARNING: Possibly unsupported ROM: mismatched MD5.
Cartridge_MD5: f34f08e5eb96e500e851a80be3277a56
Cartridge_name: Breakout - Breakaway IV (1978) (Atari)

Running ROM file...
Random seed is 0
2017-12-07 15:19:09,891 Using minimal action set with size 4
2017-12-07 15:19:09,891 Using ALE Environment
2017-12-07 15:19:09,891 Replay memory size: 1000000
Traceback (most recent call last):
File "src/main.py", line 104, in
net = DeepQNetwork(env.numActions(), args)
File "/home/oem/work/Git/simple_dqn/src/deepqnetwork.py", line 34, in init
stochastic_round = args.stochastic_round)
File "/home/oem/work/Git/neon/neon/backends/init.py", line 113, in gen_backend
deterministic=deterministic)
File "/home/oem/work/Git/neon/neon/backends/backend.py", line 471, in allocate_backend
raise ValueError("backend must be one of (%s)" % (names,))
ValueError: backend must be one of ('cpu', 'mkl')

[tambetm]

I suspect you don't have GPU dependencies installed, see http://neon.nervanasys.com/docs/0.9.0/installation.html#optional-dependencies.