diff --git a/.gitignore b/.gitignore
index ad8270f018a1bb2a11ee9039e6e07c38b5d57303..361aab47cd91c6038f7df9b1587e551cfcf15555 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,3 +19,4 @@ build
 *.egg
 src/
 record.txt
+dask-worker-space
diff --git a/bob/learn/em/factor_analysis.py b/bob/learn/em/factor_analysis.py
index 4d69d7cb4dba85ff67469967a3265dfc8981599c..37c3af6d9acda80cc7429982c4900e6b191184e7 100644
--- a/bob/learn/em/factor_analysis.py
+++ b/bob/learn/em/factor_analysis.py
@@ -7,6 +7,7 @@ import logging
 import operator
 
 import dask
+import dask.bag
 import numpy as np
 
 from dask.delayed import Delayed
diff --git a/bob/learn/em/wccn.py b/bob/learn/em/wccn.py
index 32a4e80788c135a5b5a8c5c07d3c5fc1abc59eaf..0f01b815caa7aeef31e841ae9e387327d43baf23 100644
--- a/bob/learn/em/wccn.py
+++ b/bob/learn/em/wccn.py
@@ -90,6 +90,3 @@ class WCCN(TransformerMixin, BaseEstimator):
     def transform(self, X):
 
         return ((X - self.input_subtract) / self.input_divide) @ self.weights
-
-    def _more_tags(self):
-        return {"stateless": False, "requires_fit": True}
diff --git a/bob/learn/em/whitening.py b/bob/learn/em/whitening.py
index 4b78da8dbd3c3a2fa75bade6a31dd4d11c535938..4b196ba27208ea4f45ab1805fd00f4426059c3b8 100644
--- a/bob/learn/em/whitening.py
+++ b/bob/learn/em/whitening.py
@@ -75,6 +75,3 @@ class Whitening(TransformerMixin, BaseEstimator):
 
     def transform(self, X):
         return ((X - self.input_subtract) / self.input_divide) @ self.weights
-
-    def _more_tags(self):
-        return {"stateless": False, "requires_fit": True}