diff --git a/src/triacontagon/batch.py b/src/triacontagon/batch.py
index ec66f5f..9688d03 100644
--- a/src/triacontagon/batch.py
+++ b/src/triacontagon/batch.py
@@ -38,9 +38,9 @@ def _same_data_org(pos_data: Data, neg_data: Data):
 
     test = [ [ len(pos_data.edge_types[i].adjacency_matrices[k].values()) == \
         len(neg_data.edge_types[i].adjacency_matrices[k].values()) \
-            for k in range(len(pos_data.edge_types[i])) ] \
+            for k in range(len(pos_data.edge_types[i].adjacency_matrices)) ] \
                 for i in pos_data.edge_types.keys() ]
-    test = reduce(list.__add__, test)
+    test = reduce(list.__add__, test, [])
     if not all(test):
         return False
 
@@ -112,7 +112,7 @@ class DualBatcher(object):
         offsets[edge_idx][rel_idx] += self.batch_size
 
         res = TrainingBatch(et.vertex_type_row, et.vertex_type_column,
-            rel_idx, lst, torch.full(len(lst), target_value,
+            rel_idx, lst, torch.full(( len(lst), ), target_value,
                 dtype=torch.float32))
 
         return res
diff --git a/tests/triacontagon/test_batch.py b/tests/triacontagon/test_batch.py
index f145380..46ce6a3 100644
--- a/tests/triacontagon/test_batch.py
+++ b/tests/triacontagon/test_batch.py
@@ -1,9 +1,59 @@
-from triacontagon.batch import Batcher
+from triacontagon.batch import _same_data_org, \
+    DualBatcher, \
+    Batcher
 from triacontagon.data import Data
 from triacontagon.decode import dedicom_decoder
 import torch
 
 
+def test_same_data_org_01():
+    data = Data()
+    assert _same_data_org(data, data)
+
+    data.add_vertex_type('Foo', 10)
+    assert _same_data_org(data, data)
+
+    data.add_vertex_type('Bar', 10)
+    assert _same_data_org(data, data)
+
+    data_1 = Data()
+    assert not _same_data_org(data, data_1)
+
+    data_1.add_vertex_type('Foo', 10)
+    assert not _same_data_org(data, data_1)
+
+    data_1.add_vertex_type('Bar', 10)
+    assert _same_data_org(data, data_1)
+
+
+def test_same_data_org_02():
+    data = Data()
+    data.add_vertex_type('Foo', 4)
+    data.add_edge_type('Foo-Foo', 0, 0, [
+        torch.tensor([
+            [0, 0, 0, 1],
+            [1, 0, 0, 0],
+            [0, 1, 1, 0],
+            [1, 0, 1, 0]
+        ]).to_sparse()
+    ], dedicom_decoder)
+
+    assert _same_data_org(data, data)
+
+    data_1 = Data()
+    data_1.add_vertex_type('Foo', 4)
+    data_1.add_edge_type('Foo-Foo', 0, 0, [
+        torch.tensor([
+            [0, 0, 0, 1],
+            [1, 0, 0, 0],
+            [0, 1, 1, 0],
+            [1, 0, 0, 0]
+        ]).to_sparse()
+    ], dedicom_decoder)
+
+    assert not _same_data_org(data, data_1)
+
+
 def test_batcher_01():
     d = Data()
     d.add_vertex_type('Gene', 5)
@@ -197,3 +247,70 @@ def test_batcher_05():
         (0, 1, 0, 0, 1), (0, 1, 0, 1, 0), (0, 1, 0, 1, 3),
         (0, 1, 0, 2, 1), (0, 1, 0, 3, 2), (0, 1, 0, 4, 1),
         (0, 1, 0, 4, 2) }
+
+
+def test_dual_batcher_01():
+    d = Data()
+    d.add_vertex_type('Gene', 5)
+    d.add_vertex_type('Drug', 4)
+
+    d.add_edge_type('Gene-Gene', 0, 0, [
+        torch.tensor([
+            [0, 1, 0, 1, 0],
+            [0, 0, 0, 0, 1],
+            [1, 0, 0, 0, 0],
+            [0, 0, 1, 0, 0],
+            [0, 0, 0, 1, 0]
+        ]).to_sparse(),
+
+        torch.tensor([
+            [1, 0, 1, 0, 0],
+            [0, 0, 0, 1, 0],
+            [0, 0, 0, 0, 1],
+            [0, 1, 0, 0, 0],
+            [0, 0, 1, 0, 0]
+        ]).to_sparse()
+    ], dedicom_decoder)
+
+    d.add_edge_type('Gene-Drug', 0, 1, [
+        torch.tensor([
+            [0, 1, 0, 0],
+            [1, 0, 0, 1],
+            [0, 1, 0, 0],
+            [0, 0, 1, 0],
+            [0, 1, 1, 0]
+        ]).to_sparse()
+    ], dedicom_decoder)
+
+    b = DualBatcher(d, d, batch_size=5)
+
+    visited_pos = set()
+    visited_neg = set()
+    for t_pos, t_neg in b:
+        assert t_pos.vertex_type_row == t_neg.vertex_type_row
+        assert t_pos.vertex_type_column == t_neg.vertex_type_column
+        assert t_pos.relation_type_index == t_neg.relation_type_index
+        assert len(t_pos.edges) == len(t_neg.edges)
+
+        for e in t_pos.edges:
+            k = (t_pos.vertex_type_row, t_pos.vertex_type_column,
+                t_pos.relation_type_index,) + \
+                    tuple(e.tolist())
+            visited_pos.add(k)
+
+        for e in t_neg.edges:
+            k = (t_neg.vertex_type_row, t_neg.vertex_type_column,
+                t_neg.relation_type_index,) + \
+                    tuple(e.tolist())
+            visited_neg.add(k)
+
+    expected = { (0, 0, 0, 0, 1), (0, 0, 0, 0, 3),
+        (0, 0, 0, 1, 4), (0, 0, 0, 2, 0), (0, 0, 0, 3, 2), (0, 0, 0, 4, 3),
+        (0, 0, 1, 0, 0), (0, 0, 1, 0, 2), (0, 0, 1, 1, 3), (0, 0, 1, 2, 4),
+        (0, 0, 1, 3, 1), (0, 0, 1, 4, 2),
+        (0, 1, 0, 0, 1), (0, 1, 0, 1, 0), (0, 1, 0, 1, 3),
+        (0, 1, 0, 2, 1), (0, 1, 0, 3, 2), (0, 1, 0, 4, 1),
+        (0, 1, 0, 4, 2) }
+
+    assert visited_pos == expected
+    assert visited_neg == expected