The format of the experimental results "experiment.json" is not an valid json file

[PurityFan]

Short summary about the issue/question:
The format of the experimental results "experiment.json" is not an valid json file.
Currently, the experiment result "experiment.json" give by NNI is like this:
{ "id": "ZSYg8d6K", "params": {}, "searchSpace": {}, "maxTrialNum": 10000, "trialConcurrency": 5}[ {"id": "IYnpf", "status": "SUCCEEDED", "hyperParameters": {}, "finalMetricData": []"intermediate": []} {"id": "IYnpf", "status": "SUCCEEDED", "hyperParameters": {}, "finalMetricData": []"intermediate": []} {"id": "IYnpf", "status": "SUCCEEDED", "hyperParameters": {}, "finalMetricData": []"intermediate": []} ]

In other words, NNI give the result as the format like:
{experiment_information}[trial_information1, trial_information2, trial_information3]

But this is not a legal json file format.

Need to make improvements in later versions.

How to reproduce it:

Download "experiment.json" file in WebUI

nni Environment:

• nni version: 0.5.2
• nni mode(local|pai|remote): pai
• OS: Ubuntu
• python version: 3.5.2
• is conda or virtualenv used?: no
• is running in docker?: yes

[PurityFan]

problem solved by #899 . Thanks Lijiao~