[Bugfix] Add bool data type to backend. (dmlc#1487)

* add bool to F.data_type_dict

* add utest

* skip bool test for mx

python/dgl/backend/backend.py

@@ -28,6 +28,7 @@ def data_type_dict():
     int16
     int32
     int64
+    bool
 
     This function will be called only *once* during the initialization fo the
     backend module. The returned dictionary will become the attributes of the

python/dgl/backend/mxnet/tensor.py

@@ -28,7 +28,8 @@ def data_type_dict():
             'int8'    : np.int8,
             'int16'   : np.int16,
             'int32'   : np.int32,
-            'int64'   : np.int64}
+            'int64'   : np.int64,
+            'bool'    : np.bool}
 
 def cpu():
     return mx.cpu()

python/dgl/backend/pytorch/tensor.py

@@ -24,7 +24,8 @@ def data_type_dict():
             'int8'    : th.int8,
             'int16'   : th.int16,
             'int32'   : th.int32,
-            'int64'   : th.int64}
+            'int64'   : th.int64,
+            'bool'    : th.bool}
 
 def cpu():
     return th.device('cpu')

python/dgl/backend/tensorflow/tensor.py

@@ -50,7 +50,8 @@ def data_type_dict():
             'int8': tf.int8,
             'int16': tf.int16,
             'int32': tf.int32,
-            'int64': tf.int64}
+            'int64': tf.int64,
+            'bool' : tf.bool}
 
 def cpu():
     return "/cpu:0"

tests/compute/test_frame.py

@@ -4,6 +4,9 @@
 import backend as F
 import dgl
 import unittest
+import pickle
+import pytest
+import io
 
 N = 10
 D = 5
@@ -15,10 +18,10 @@ def check_fail(fn):
     except:
         return True
 
-def create_test_data(grad=False):
-    c1 = F.randn((N, D))
-    c2 = F.randn((N, D))
-    c3 = F.randn((N, D))
+def create_test_data(grad=False, dtype=F.float32):
+    c1 = F.astype(F.randn((N, D)), dtype)
+    c2 = F.astype(F.randn((N, D)), dtype)
+    c3 = F.astype(F.randn((N, D)), dtype)
     if grad:
         c1 = F.attach_grad(c1)
         c2 = F.attach_grad(c2)
@@ -357,6 +360,23 @@ def test_inplace():
     newa2addr = id(f['a2'])
     assert a2addr == newa2addr
 
+def _reconstruct_pickle(obj):
+    f = io.BytesIO()
+    pickle.dump(obj, f)
+    f.seek(0)
+    obj = pickle.load(f)
+    f.close()
+    return obj
+
+@pytest.mark.parametrize('dtype',
+        [F.float32, F.int32] if dgl.backend.backend_name == "mxnet" else [F.float32, F.int32, F.bool])
+def test_pickle(dtype):
+    f = create_test_data(dtype=dtype)
+    newf = _reconstruct_pickle(f)
+    assert F.array_equal(f['a1'], newf['a1'])
+    assert F.array_equal(f['a2'], newf['a2'])
+    assert F.array_equal(f['a3'], newf['a3'])
+
 if __name__ == '__main__':
     test_create()
     test_column1()