TypeError: 0.84068537 is not JSON serializable

[sara-kassani]

The error is for utils.py

utils.py", line 80, in train
write_event(log, step, loss=mean_loss)

utils.py", line 26, in write_event
log.write(json.dumps(data, sort_keys=True))

File "C:\Users\Lab\AppData\Local\Programs\Python\Python35\lib\json_init_.py", line 237, in dumps
**kw).encode(obj)
File "C:\Users\Lab\AppData\Local\Programs\Python\Python35\lib\json\encoder.py", line 198, in encode
chunks = self.iterencode(o, _one_shot=True)
File "C:\Users\Lab\AppData\Local\Programs\Python\Python35\lib\json\encoder.py", line 256, in iterencode
return _iterencode(o, 0)
File "C:\Users\Lab\AppData\Local\Programs\Python\Python35\lib\json\encoder.py", line 179, in default
raise TypeError(repr(o) + " is not JSON serializable")
TypeError: 0.84068537 is not JSON serializable