[Python] Remove logloss for speed reason

python/mxnet/metric.py

@@ -54,8 +54,10 @@ def update(self, label, pred):
         self.sum_metric += numpy.sum(pred_label == label)
         self.num_inst += label.size
 
+# pylint: disable=pointless-string-statement
+"""
 class LogLoss(EvalMetric):
-    """Calculate logloss"""
+    # remove because it because it is too slow
     def __init__(self):
         self.eps = 1e-15
         super(LogLoss, self).__init__('logloss')
@@ -70,6 +72,8 @@ def update(self, label, pred):
             p = max(min(p, 1 - self.eps), self.eps)
             self.sum_metric += -numpy.log(p)
         self.num_inst += label.size
+"""
+# pylint: enable=pointless-string-statement
 
 class CustomMetric(EvalMetric):
     """Custom evaluation metric that takes a NDArray function.
@@ -128,7 +132,5 @@ def create(metric):
         raise TypeError('metric should either be callable or str')
     if metric == 'acc' or metric == 'accuracy':
         return Accuracy()
-    elif metric == 'logloss':
-        return LogLoss()
     else:
         raise ValueError('Cannot find metric %s' % metric)