def set_val_summary(self, summary):
callBigDlFunc(self.bigdl_type, "<STR_LIT>", self.value,<EOL>summary)<EOL>return self<EOL>
Set validation summary. A ValidationSummary object contains information
necessary for the optimizer to know how often the logs are recorded,
where to store the logs and how to retrieve them, etc. For details,
refer to the docs of ValidationSummary.


:param summary: a ValidationSummary object