Can not read and pass on the results about bhtsne

[lvdmaaten]

FFI = Foreign function interface

I think there exist several FFIs for Python; I've been using ctypes in the past.

[gpapadop79]

result.dat is created in a temporary folder. In your case it tries to create it in /var.

Check if your user has permission to create folders in /var

[Nightrord]

@gpapadop79 thanks for the infos. Because the matrix as the input is large(95 rows and 745544 columns), if there is no enough memory, should it cause this problem? As the folder is a temporary one, how to check the permission to create folders?

Thanks in advance

[lvdmaaten]

Is the t-SNE algorithm itself actually being run? Like do you see a loss being printed every 50 iterations or something like that? The result file should actually be really small (95x2 matrix), so I would be surprised if this were an OOM problem.

To check permissions, you can do something like ls -la /var/folders/92/8ty0c6392m773r5tbp4s9gy80000gp/T/tmpakdFT0 and confirm that there are w for the three sets of users? Alternatively, try running this with sudo to see if that helps?

@rohit-gupta Perhaps it makes sense to have an input option to specify the folder for intermediate results? I am not a Python user, so I am not familiar with the exact behavior of mkdtemp().

[Nightrord]

The t-SNE algorithm doesn't run and it directly show the error: IOError: [Errno 2] No such file or directory: '/var/folders/92/8ty0c6392m773r5tbp4s9gy80000gp/T/tmpllxm8j/result.dat'. I think the problem is the input matrix so large, I will try it on some other machine.

[lvdmaaten]

Can you please copy-paste the full output? Does the data.dat file get written by the Python wrapper?

[Nightrord]

Here is the full output
~/Projects/bhtsne (master*) $ python bhtsne.py -i ~/Projects/tsne_python/lan_uid_matrix_tsne1.txt -o ~/Dropbox/github/data/lan_uid_coordinate.txt -p 5 -d 2 -t 1 -v

Error: could not open data file.
Traceback (most recent call last):
File "bhtsne.py", line 233, in
exit(main(argv))
File "bhtsne.py", line 224, in main
verbose=argp.verbose, initial_dims=argp.initial_dims, use_pca=argp.use_pca, max_iter=argp.max_iter):
File "bhtsne.py", line 211, in run_bh_tsne
for result in bh_tsne(tmp_dir_path, verbose):
File "bhtsne.py", line 164, in bh_tsne
with open(path_join(workdir, 'result.dat'), 'rb') as output_file:
IOError: [Errno 2] No such file or directory: '/var/folders/92/8ty0c6392m773r5tbp4s9gy80000gp/T/tmpllxm8j/result.dat'

The problem is that it can not find the intermediate file result.data.

[lvdmaaten]

The way the code works is: (1) Python wrapper writes data.dat, (2) binary runs t-SNE on data.dat, (3) binary writes results into result.dat, and (4) Python wrapper reads result.dat. Therefore, we first need to determine in which step things go wrong. The output suggests the problem is actually in step 1. Can you confirm by checking whether or not data.dat gets written?

[Nightrord]

The file data.dat has been written. But there is no result.dat. I think the problem happens on step 3.

[Nightrord]

I have run the data on another computer and I meet the same problem. Here is the output:

Traceback (most recent call last):
File "bhtsne.py", line 233, in
exit(main(argv))
File "bhtsne.py", line 224, in main
verbose=argp.verbose, initial_dims=argp.initial_dims, use_pca=argp.use_pca, max_iter=argp.max_iter):
File "bhtsne.py", line 206, in run_bh_tsne
init_bh_tsne(input_file, tmp_dir_path, no_dims=no_dims, perplexity=perplexity, theta=theta, randseed=randseed,verbose=verbose, initial_dims=initial_dims, use_pca=use_pca, max_iter=max_iter)
File "bhtsne.py", line 118, in init_bh_tsne
cov_x = np.dot(np.transpose(samples), samples)
MemoryError
Error: could not open data file.
Traceback (most recent call last):
File "bhtsne.py", line 233, in
exit(main(argv))
File "bhtsne.py", line 224, in main
verbose=argp.verbose, initial_dims=argp.initial_dims, use_pca=argp.use_pca, max_iter=argp.max_iter):
File "bhtsne.py", line 211, in run_bh_tsne
for result in bh_tsne(tmp_dir_path, verbose):
File "bhtsne.py", line 164, in bh_tsne
with open(path_join(workdir, 'result.dat'), 'rb') as output_file:
IOError: [Errno 2] No such file or directory: '/tmp/tmpiXA4u_/result.dat'

It still cannot find the result.dat and it also mentions MemoryError.
And this time, the data.dat file has not been written.
I think the problem is Python wrapper does not writer data.dat.

[EMCP]

@lvdmaaten , just wanted to ask.. for those of us using the wrapper from within another python program.. we do not expect to see a data.dat file.. since the data is being fed via the call to run_bh_tsne correct?

[lvdmaaten]

The Python wrapper is writing a data.dat file, and then calling the bh_tsne binary. The binary writes the results in a results.dat file, which the wrapper reads in. Afterwards, the wrapper deletes both .dat files. So you would expect to see a data.dat file whilst the binary is running.

The whole thing is pretty clunky... I've been meaning to change this to a FFI call, but I haven't got around to doing that yet.

[EMCP]

Understood. I guess I'm not seeing a data.dat then.. but it's likely related to the numppy crash I'm experiencing in OSX ...

Edit : After installing openBLAS and compiling numpy, wrapper functions (except inside of jupyter notebook, but that's an understood limitation I think.)

one last thing @lvdmaaten FFI means https://cffi.readthedocs.io/en/latest/overview.html ?