Demo of the tfdbg curses CLI: Locating the source of bad numerical values with TF v2.

This demo contains a classical example of a neural network for the mnist
dataset, but modifications are made so that problematic numerical values (infs
and nans) appear in nodes of the graph during training.

flags:

absl.app:
  -?,--[no]help: show this help
    (default: 'false')
  --[no]helpfull: show full help
    (default: 'false')
  --[no]helpshort: show this help
    (default: 'false')
  --[no]helpxml: like --helpfull, but generates XML output
    (default: 'false')
  --[no]only_check_args: Set to true to validate args and exit.
    (default: 'false')
  --[no]pdb: Alias for --pdb_post_mortem.
    (default: 'false')
  --[no]pdb_post_mortem: Set to true to handle uncaught exceptions with PDB post
    mortem.
    (default: 'false')
  --profile_file: Dump profile information to a file (for python -m pstats).
    Implies --run_with_profiling.
  --[no]run_with_pdb: Set to true for PDB debug mode
    (default: 'false')
  --[no]run_with_profiling: Set to true for profiling the script. Execution will
    be slower, and the output format might change over time.
    (default: 'false')
  --[no]use_cprofile_for_profiling: Use cProfile instead of the profile module
    for profiling. This has no effect unless --run_with_profiling is set.
    (default: 'true')

absl.logging:
  --[no]alsologtostderr: also log to stderr?
    (default: 'false')
  --log_dir: directory to write logfiles into
    (default: '')
  --logger_levels: Specify log level of loggers. The format is a CSV list of
    `name:level`. Where `name` is the logger name used with
    `logging.getLogger()`, and `level` is a level name  (INFO, DEBUG, etc). e.g.
    `myapp.foo:INFO,other.logger:DEBUG`
    (default: '')
  --[no]logtostderr: Should only log to stderr?
    (default: 'false')
  --[no]showprefixforinfo: If False, do not prepend prefix to info messages when
    it's logged to stderr, --verbosity is set to INFO level, and python logging
    is used.
    (default: 'true')
  --stderrthreshold: log messages at this level, or more severe, to stderr in
    addition to the logfile.  Possible values are 'debug', 'info', 'warning',
    'error', and 'fatal'.  Obsoletes --alsologtostderr. Using --alsologtostderr
    cancels the effect of this flag. Please also note that this flag is subject
    to --verbosity and requires logfile not be stderr.
    (default: 'fatal')
  -v,--verbosity: Logging verbosity level. Messages logged at this level or
    lower will be included. Set to 1 for debug logging. If the flag was not set
    or supplied, the value will be changed from the default of -1 (warning) to 0
    (info) after flags are parsed.
    (default: '-1')
    (an integer)

absl.testing.absltest:
  --test_random_seed: Random seed for testing. Some test frameworks may change
    the default value of this flag between runs, so it is not appropriate for
    seeding probabilistic tests.
    (default: '301')
    (an integer)
  --test_randomize_ordering_seed: If positive, use this as a seed to randomize
    the execution order for test cases. If "random", pick a random seed to use.
    If 0 or not set, do not randomize test case execution order. This flag also
    overrides the TEST_RANDOMIZE_ORDERING_SEED environment variable.
    (default: '')
  --test_srcdir: Root of directory tree where source files live
    (default: '')
  --test_tmpdir: Directory for temporary testing files
    (default: '/tmp/absl_testing')
  --xml_output_file: File to store XML test results
    (default: '')

tensorflow.python.ops.parallel_for.pfor:
  --[no]op_conversion_fallback_to_while_loop: DEPRECATED: Flag is ignored.
    (default: 'true')

tensorflow.python.tpu.client.client:
  --[no]runtime_oom_exit: Exit the script when the TPU runtime is OOM.
    (default: 'true')

absl.flags:
  --flagfile: Insert flag definitions from the given file into the command line.
    (default: '')
  --undefok: comma-separated list of flag names that it is okay to specify on
    the command line even if the program does not define a flag with that name.
    IMPORTANT: flags in this list that have arguments MUST use the --flag=value
    format.
    (default: '')