Replace NaN in X-coordinate with None (#157)

neptune/experiments.py

@@ -353,6 +353,9 @@ def log_metric(self, log_name, x, y=None, timestamp=None):
         if not is_float(y):
             raise InvalidChannelValue(expected_type='float', actual_type=type(y).__name__)
 
+        if x is not None and is_nan_or_inf(x):
+            x = None
+
         if is_nan_or_inf(y):
             # pylint: disable=global-statement
             global _nan_warning_sent
@@ -411,6 +414,9 @@ def log_text(self, log_name, x, y=None, timestamp=None):
         """
         x, y = self._get_valid_x_y(x, y)
 
+        if x is not None and is_nan_or_inf(x):
+            x = None
+
         if not isinstance(y, six.string_types):
             raise InvalidChannelValue(expected_type='str', actual_type=type(y).__name__)
 
@@ -462,6 +468,9 @@ def log_image(self, log_name, x, y=None, image_name=None, description=None, time
         """
         x, y = self._get_valid_x_y(x, y)
 
+        if x is not None and is_nan_or_inf(x):
+            x = None
+
         input_image = dict(
             name=image_name,
             description=description,