Allennlp does not work with ipdb

[Boltzmachine]

when I insert ipdb.set_trace(), it encounters

Traceback (most recent call last):
  File "/home/qiuweikang/miniconda3/envs/spanrel/bin/allennlp", line 8, in <module>
    sys.exit(run())
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/allennlp/run.py", line 18, in run
    main(prog="allennlp")
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/allennlp/commands/__init__.py", line 102, in main
    args.func(args)
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/allennlp/commands/train.py", line 116, in train_model_from_args
    args.cache_prefix)
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/allennlp/commands/train.py", line 160, in train_model_from_file
    cache_directory, cache_prefix)
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/allennlp/commands/train.py", line 258, in train_model
    batch_weight_key="")
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/allennlp/training/util.py", line 395, in evaluate
    output_dict = model(**batch)
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/torch/nn/modules/module.py", line 1102, in _call_impl
    return forward_call(*input, **kwargs)
  File "./brat_multitask/models/brat_multitask.py", line 660, in forward
    import ipdb; ipdb.set_trace()
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/ipdb/__main__.py", line 77, in set_trace
    p = _init_pdb(context).set_trace(frame)
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/ipdb/__main__.py", line 54, in _init_pdb
    debugger_cls = _get_debugger_cls()
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/ipdb/__main__.py", line 34, in _get_debugger_cls
    ipapp.initialize(["--no-term-title"])
  File "<decorator-gen-113>", line 2, in initialize
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/traitlets/config/application.py", line 87, in catch_config_error
    return method(app, *args, **kwargs)
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/IPython/terminal/ipapp.py", line 317, in initialize
    self.init_shell()
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/IPython/terminal/ipapp.py", line 333, in init_shell
    ipython_dir=self.ipython_dir, user_ns=self.user_ns)
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/traitlets/config/configurable.py", line 412, in instance
    inst = cls(*args, **kwargs)
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/IPython/terminal/interactiveshell.py", line 525, in __init__
    self.init_prompt_toolkit_cli()
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/IPython/terminal/interactiveshell.py", line 330, in init_prompt_toolkit_cli
    **self._extra_prompt_options())
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/prompt_toolkit/shortcuts/prompt.py", line 476, in __init__
    self.app = self._create_application(editing_mode, erase_when_done)
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/prompt_toolkit/shortcuts/prompt.py", line 765, in _create_application
    output=self._output,
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/prompt_toolkit/application/application.py", line 280, in __init__
    self.output = output or session.output
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/prompt_toolkit/application/current.py", line 71, in output
    self._output = create_output()
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/prompt_toolkit/output/defaults.py", line 99, in create_output    enable_bell=bell_from_env,
  File "/home/qiuweikang/miniconda3/envs/spanrel/lib/python3.6/site-packages/prompt_toolkit/output/vt100.py", line 465, in from_pty
    fd = stdout.fileno()
AttributeError: 'TeeLogger' object has no attribute 'fileno'

[dirkgr]

I don't think this has anything to do with AllenNLP. It looks like the error comes out of a thing called "prompt toolkit". We also don't use TeeLogger anywhere in AllenNLP.