CPU only mode in Caffe

[azamosavi]

We have installed Caffe and all its prerequisites except CUDA on Fedora. We want to run Caffe in CPU mode and we have made changes to support this by changing the config file during installation as well as prototxt files.
However, when we run the Matlab script calling Caffe:
caffe('set_device', 1);

we get the following error:
Logging before InitGoogleLogging() is written to STDERR
F0401 22:36:01.857090 18173 common.cpp:55] Cannot use GPU in CPU-only Caffe: check mode.

I was wondering if anyone can help us CPU only mode for Caffe in Matlab.

[sbrugman]

I get the same error when reproducing the steps from https://github.com/BVLC/caffe/tree/master/examples/finetune_flickr_style in CPU-mode. "Now we can train! (You can fine-tune in CPU mode by leaving out the -gpu flag.)"

caffe % ./build/tools/caffe train -solver models/finetune_flickr_style/solver.prototxt -weights models/bvlc_reference_caffenet/bvlc_reference_caffenet.caffemodel

I0403 18:09:40.822396 7323 caffe.cpp:113] Use GPU with device ID 0
F0403 18:09:40.822931 7323 common.cpp:55] Cannot use GPU in CPU-only Caffe: check mode.
*** Check failure stack trace: ***
@ 0x7f901eccedaa (unknown)
@ 0x7f901eccece4 (unknown)
@ 0x7f901ecce6e6 (unknown)
@ 0x7f901ecd1687 (unknown)
@ 0x7f901f0d5af0 caffe::Caffe::SetDevice()
@ 0x406312 train()
@ 0x404901 main
@ 0x7f901e1e0ec5 (unknown)
@ 0x404ead (unknown)
@ (nil) (unknown)

[abhaysac]

models/finetune_flickr_style/solver.prototxt, uncomment the last line.

On Fri, Apr 3, 2015 at 9:42 PM, Simon Brugman notifications@github.com
wrote:

I get the same error when reproducing the steps from
https://github.com/BVLC/caffe/tree/master/examples/finetune_flickr_style
in CPU-mode. "Now we can train! (You can fine-tune in CPU mode by leaving
out the -gpu flag.)"

caffe % ./build/tools/caffe train -solver
models/finetune_flickr_style/solver.prototxt -weights
models/bvlc_reference_caffenet/bvlc_reference_caffenet.caffemodel

I0403 18:09:40.822396 7323 caffe.cpp:113] Use GPU with device ID 0
F0403 18:09:40.822931 7323 common.cpp:55] Cannot use GPU in CPU-only
Caffe: check mode.
*** Check failure stack trace: ***
@ 0x7f901eccedaa (unknown)
@ 0x7f901eccece4 (unknown)
@ 0x7f901ecce6e6 (unknown)
@ 0x7f901ecd1687 (unknown)
@ 0x7f901f0d5af0 caffe::Caffe::SetDevice()
@ 0x406312 train()
@ 0x404901 main
@ 0x7f901e1e0ec5 (unknown)
@ 0x404ead (unknown)
@ (nil) (unknown)

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#2241 (comment).

[azamosavi]

The problem is solved, in CPU mode we should not call
caffe('set_device', 1)
This line of code is just for using GPU mode.

[hana9090]

@azamosavi
Please, where I can i found this line of code?

[azamosavi]

@hana9090
Just look for set_device in your code. if its 1 comment the line cause its for GPU mode.

[blackdusts]

If you choose "only cpu" mode, except you should delete "#" in "# CPU_ONLY := 1" of Makefile.config. and you also should modify something in your example. For example, if you train MNIST, you should modify file "lenet_solver.prototxt" in /your caffe path/examples/MNIST, in the last line of this file ,you should modify solver mode to be CPU.

[annanurov]

...and how do you "modify solver to be CPU"?
>caffe train -solver=lenet.prototxt -cpu?

Thank you

[annanurov]

OK, just found it. Never mind....:P

[ahlemlouma]

i have the same problem can someone help me plz
F0929 20:55:49.671247 6050 base_data_layer.cpp:84] Cannot use GPU in CPU-only Caffe: check mode.
*** Check failure stack trace: ***
Aborted (core dumped)