fix: export directory issue

spleeter/utils/estimator.py

@@ -4,6 +4,8 @@
 """ Utility functions for creating estimator. """
 
 from pathlib import Path
+from os.path import join
+from tempfile import gettempdir
 
 # pylint: disable=import-error
 import tensorflow as tf
@@ -15,7 +17,7 @@ from ..model import model_fn
 from ..model.provider import get_default_model_provider
 
 # Default exporting directory for predictor.
-DEFAULT_EXPORT_DIRECTORY = '/tmp/serving'
+DEFAULT_EXPORT_DIRECTORY = join(gettempdir(), 'serving')
 
 
 def create_estimator(params, MWF):