Allow serializing NaN in SDK

src/sdk/pynni/nni/msg_dispatcher.py

@@ -79,7 +79,7 @@ def _pack_parameter(parameter_id, params, customized=False, trial_job_id=None, p
         ret['parameter_index'] = parameter_index
     else:
         ret['parameter_index'] = 0
-    return json_tricks.dumps(ret)
+    return json_tricks.dumps(ret, allow_nan=True)
 
 
 class MsgDispatcher(MsgDispatcherBase):

src/sdk/pynni/nni/platform/local.py

@@ -52,7 +52,7 @@ def request_next_parameter():
         'type': 'REQUEST_PARAMETER',
         'sequence': 0,
         'parameter_index': _param_index
-    })
+    }, allow_nan=True)
     send_metric(metric)
 
 def get_next_parameter():

src/sdk/pynni/nni/trial.py

@@ -82,7 +82,7 @@ def report_intermediate_result(metric):
         'type': 'PERIODICAL',
         'sequence': _intermediate_seq,
         'value': metric
-    })
+    }, allow_nan=True)
     _intermediate_seq += 1
     platform.send_metric(metric)
 
@@ -98,5 +98,5 @@ def report_final_result(metric):
         'type': 'FINAL',
         'sequence': 0,
         'value': metric
-    })
+    }, allow_nan=True)
     platform.send_metric(metric)