WebUI has no content due to incorrect metric

[colorjam]

Short summary about the issue/question:
metric contains str so the WebUI cannot display content. I tried to export trials by CSV type, but got the following errors:

Traceback (most recent call last):
  File "/home/chenqian/miniconda3/envs/py37/bin/nnictl", line 11, in <module>
    load_entry_point('nni', 'console_scripts', 'nnictl')()
  File "/home/chenqian/workspace/nni/build/nni_cmd/nnictl.py", line 223, in parse_args
    args.func(args)
  File "/home/chenqian/workspace/nni/build/nni_cmd/nnictl_utils.py", line 703, in export_trials_data
    formated_record = {**record['parameter'], **record['value'], **{'id': record['id']}}
TypeError: 'str' object is not a mapping

The JOSN type output file shows that there are -Infinity in the metric

Brief what process you are following:
I use -loss as the metric, some trials run well while the final results are-Infinity.

How to reproduce it:

nni Environment:

• nni version:
• nni mode(local|pai|remote):
• OS:
• python version:
• is conda or virtualenv used?:
• is running in docker?:

need to update document(yes/no):

Anything else we need to know:

[liuzhe-lz]

NNI v1.5 adds support for infinity and string metrics. It should be released on today or tomorrow.

NNI cannot export non-dict metrics to CSV file at this moment. You may export to JSON file instead.

[scarlett2018]

Closing it as the issue is fixed in 1.5. @colorjam - please feel free to reopen if there are still issues after you try 1.5.