Bug

[Tveek]

Running this code python python/gps/gps_main.py box2d_badmm_example;In the Calculating step,there has error below:
/home/prafly/desktop/gps/python/gps/algorithm/policy_opt/policy_opt_caffe.py:140: RuntimeWarning: divide by zero encountered in divide
self.policy.scale = np.diag(1.0 / np.std(obs, axis=0))
I0511 10:33:26.268626 17880 solver.cpp:341] Iteration 0, Testing net (#0)
I0511 10:33:26.268664 17880 net.cpp:748] Ignoring source layer Python4
I0511 10:33:26.268708 17880 solver.cpp:409] Test net output #0: InnerProduct3 = 0.000162208
I0511 10:33:26.268729 17880 solver.cpp:409] Test net output #1: InnerProduct3 = -0.00041328
I0511 10:33:26.268740 17880 solver.cpp:341] Iteration 0, Testing net (#1)
I0511 10:33:26.268748 17880 net.cpp:748] Ignoring source layer Python1
I0511 10:33:26.268760 17880 net.cpp:748] Ignoring source layer Python4
I0511 10:33:26.268780 17880 solver.cpp:409] Test net output #0: InnerProduct3 = 0
I0511 10:33:26.268792 17880 solver.cpp:409] Test net output #1: InnerProduct3 = 0
I0511 10:33:29.947541 17880 net.cpp:748] Ignoring source layer Python4
I0511 10:33:29.948006 17880 net.cpp:748] Ignoring source layer Python4
I0511 10:33:30.041903 17880 net.cpp:748] Ignoring source layer Python4
/home/prafly/desktop/gps/python/gps/utility/gmm.py:202: RuntimeWarning: invalid value encountered in less
w[:, (self.mass < (1.0 / K) * 1e-4)[:, 0]] = 1.0 / N
Exception in thread Thread-2:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
self.run()
File "/usr/lib/python2.7/threading.py", line 763, in run
self.__target(_self.__args, *_self.__kwargs)
File "python/gps/gps_main.py", line 369, in
target=lambda: gps.run(itr_load=resume_training_itr)
File "python/gps/gps_main.py", line 67, in run
self._take_iteration(itr, traj_sample_lists)
File "python/gps/gps_main.py", line 195, in _take_iteration
self.algorithm.iteration(sample_lists)
File "/home/prafly/desktop/gps/python/gps/algorithm/algorithm_badmm.py", line 59, in iteration
self._update_policy_fit(m) # Update policy priors.
File "/home/prafly/desktop/gps/python/gps/algorithm/algorithm_badmm.py", line 180, in _update_policy_fit
SampleList(self.cur[m].pol_info.policy_samples)
File "/home/prafly/desktop/gps/python/gps/algorithm/policy/policy_prior_gmm.py", line 83, in update
self.gmm.update(XU, K)
File "/home/prafly/desktop/gps/python/gps/utility/gmm.py", line 174, in update
logobs = self.estep(data)
File "/home/prafly/desktop/gps/python/gps/utility/gmm.py", line 75, in estep
check_finite=False)
File "/usr/lib/python2.7/dist-packages/scipy/linalg/decomp_cholesky.py", line 81, in cholesky
check_finite=check_finite)
File "/usr/lib/python2.7/dist-packages/scipy/linalg/decomp_cholesky.py", line 30, in _cholesky
raise LinAlgError("%d-th leading minor not positive definite" % info)
LinAlgError: 1-th leading minor not positive definite

[cbfinn]

Can you provide more details? -- Is the error deterministic? What iteration did it occur at?

[Tveek]

@cbfinn It is deterministic.It occurs at first iteration.

[cbfinn]

Ok. Unfortunately, I don't have time to look into this right now because of
several upcoming deadlines. The example has worked for me in the past, so
it seems likely that this error is due to a recent pull request.

I'll be able to look into it after May 25 (unless the issue hasn't been
resolved by you or someone else by then).

@cbfinn https://github.com/cbfinn It is deterministic.It occurs at first
iteration.

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#24 (comment)

[ytian81]

I have come across this error as well, is there any solution?

[cbfinn]

Fixed in this PR: #30