Code hangs on training

[egaebel]

I'm reading multiple datasets from a single file and after a certain number of iterations the code hangs indefinitely (I let it go overnight just to be absolutely certain). I have to ctrl+C out of it and I get the following exception. Looks like a hang in multitables somewhere? Maybe from the queue not being populated quickly enough?

Traceback (most recent call last): │··
File "/usr/lib/python3.5/multiprocessing/process.py", line 249, in _bootstrap │··
self.run() │··
File "/usr/lib/python3.5/multiprocessing/process.py", line 93, in run │··
self._target(*self._args, **self._kwargs) │··
File "/workspace-mount/Programs/tachotron2-implementations/barronalex-tachotron/lib/python3.5/site-packages/multitables.py", line 389, in _Streamer__read_process │··
with sync.do(cbuf.put_direct(), i, (i+read_size) % len(ary)) as put_ary: │··
File "/workspace-mount/Programs/tachotron2-implementations/barronalex-tachotron/lib/python3.5/site-packages/multitables.py", line 136, in enter │··
with self.sync.barrier_in.wait(*self.index): │··
File "/workspace-mount/Programs/tachotron2-implementations/barronalex-tachotron/lib/python3.5/site-packages/multitables.py", line 87, in enter │··
self.sync.cvar.wait() │··
File "/usr/lib/python3.5/multiprocessing/synchronize.py", line 262, in wait │··
return self._wait_semaphore.acquire(True, timeout)

[egaebel]

I think it occurs when the end of the dataset is reached. I have cyclic=True set on get_batch though...

[ghcollin]

It seems to be stuck waiting to write to the internal queue, maybe there is an issue with ordered access? Can you try setting ordered = False, and see if it still hangs? (this will results in corrupted batches if you're splicing multiple data sets to create each training example, but might help narrow things down)

[egaebel]

Thanks for your quick response!

This indeed makes the hanging go away, but I am doing some splicing with datasets.

[ghcollin]

If you run the multitables unit tests, https://github.com/ghcollin/multitables/blob/master/multitables_test.py do they complete properly? Also what size/how many rows is your dataset(s)?

[egaebel]

Hey sorry for the long silence, I ended up changing my dataset to all be in one table and everything is working fine now.

However.
The multitables unit test hangs as well.
My dataset has 68933 rows.

[egaebel]

So actually, with my one table approach when I set the reader's ordered=False it freezes, but when ordered=True it does not freeze. Very odd...

Any tips on how I can get the multitables unit tests to run? Seems like that is probably the same thing...

[sullivan-sean]

I'm also running into the same issue.

I'm training on multiple datasets, with ordered=True as recommended, however this results in the following error:

Traceback (most recent call last):
  File "train.py", line 225, in <module>
    tf.app.run()
  File "/usr/lib/python3.7/site-packages/tensorflow/python/platform/app.py", line 125, in run
    _sys.exit(main(argv))
  File "train.py", line 221, in main
    train()
  File "train.py", line 216, in train
    filename)
  File "/usr/lib/python3.7/contextlib.py", line 130, in __exit__
    self.gen.throw(type, value, traceback)
  File "/usr/lib/python3.7/site-packages/tftables-1.1.2-py3.7.egg/tftables.py", line 552, in begin
  File "/usr/lib/python3.7/site-packages/tftables-1.1.2-py3.7.egg/tftables.py", line 521, in stop
  File "/usr/lib/python3.7/site-packages/tensorflow/python/training/coordinator.py", line 389, in join
    six.reraise(*self._exc_info_to_raise)
  File "/usr/lib/python3.7/site-packages/six.py", line 692, in reraise
    raise value.with_traceback(tb)
  File "/usr/lib/python3.7/site-packages/tensorflow/python/training/coordinator.py", line 297, in stop_on_exception
    yield
  File "/usr/lib/python3.7/site-packages/tftables-1.1.2-py3.7.egg/tftables.py", line 473, in __read_thread
  File "/usr/lib/python3.7/site-packages/tftables-1.1.2-py3.7.egg/tftables.py", line 393, in feed
  File "/usr/lib/python3.7/site-packages/tftables-1.1.2-py3.7.egg/tftables.py", line 293, in read_batch
  File "/usr/lib/python3.7/site-packages/multitables-1.1.1-py3.7.egg/multitables.py", line 270, in __enter__
    return self.arys[self.idx]
IndexError: list index out of range

When I run the same code with ordered=False, the code runs as expected but with corrupted batches.