From 866bd9a5b44564b81069833333bda4b14aa42912 Mon Sep 17 00:00:00 2001
From: janezd <janez.demsar@fri.uni-lj.si>
Date: Sat, 27 Oct 2018 19:46:43 +0300
Subject: [PATCH] Model: Raise an exception if transformation results in all
 nans

---
 Orange/base.py       | 8 ++++++++
 Orange/data/table.py | 4 ++++
 2 files changed, 12 insertions(+)

diff --git a/Orange/base.py b/Orange/base.py
index 32a4e712b0e..4251234cf04 100644
--- a/Orange/base.py
+++ b/Orange/base.py
@@ -9,6 +9,7 @@
 
 from Orange.data import Table, Storage, Instance, Value
 from Orange.data.filter import HasClass
+from Orange.data.table import DomainTransformationError
 from Orange.data.util import one_hot
 from Orange.misc.wrapper_meta import WrapperMeta
 from Orange.preprocess import Continuize, RemoveNaNColumns, SklImpute, Normalize
@@ -246,6 +247,13 @@ def __call__(self, data, ret=Value):
             if isinstance(data, Instance):
                 data = Table(data.domain, [data])
             if data.domain != self.domain:
+                if self.original_domain.attributes != data.domain.attributes \
+                        and data.X.size \
+                        and not np.isnan(data.X).all():
+                    data = data.transform(self.original_domain)
+                    if np.isnan(data.X).all():
+                        raise DomainTransformationError(
+                            "domain transformation produced no defined values")
                 data = data.transform(self.domain)
             prediction = self.predict_storage(data)
         elif isinstance(data, (list, tuple)):
diff --git a/Orange/data/table.py b/Orange/data/table.py
index c8492fbd456..65bcb62a50b 100644
--- a/Orange/data/table.py
+++ b/Orange/data/table.py
@@ -44,6 +44,10 @@ def get_sample_datasets_dir():
 _conversion_cache_lock = RLock()
 
 
+class DomainTransformationError(Exception):
+    pass
+
+
 class RowInstance(Instance):
     sparse_x = None
     sparse_y = None