Update type test to satisfy new flake8 (deepchem#3521)

deepchem/feat/tests/test_dummy_featurizer.py

@@ -23,5 +23,5 @@ def test_featurize(self):
              ]])
         featurizer = dc.feat.DummyFeaturizer()
         out = featurizer.featurize(input_array)
-        assert (type(out) == np.ndarray)
+        assert isinstance(out, np.ndarray)
         assert (out.shape == input_array.shape)

deepchem/feat/tests/test_mat_featurizer.py

@@ -22,7 +22,7 @@ def test_mat_featurizer(self):
         """
         featurizer = MATFeaturizer()
         out = featurizer.featurize(self.mol)
-        assert (type(out) == np.ndarray)
+        assert isinstance(out, np.ndarray)
         assert (out[0].node_features.shape == (3, 36))
         assert (out[0].adjacency_matrix.shape == (3, 3))
         assert (out[0].distance_matrix.shape == (3, 3))

deepchem/feat/tests/test_mxmnet_featurizer.py

@@ -125,5 +125,5 @@ def test_node_pos_features(self):
                                           pos_x=pos_x1,
                                           pos_y=pos_y1,
                                           pos_z=pos_z1)
-        assert type(graph_feat[0].node_pos_features) == np.ndarray
+        assert isinstance(graph_feat[0].node_pos_features, np.ndarray)
         assert np.allclose(graph_feat[0].node_pos_features, node_pos, atol=1e-3)

deepchem/models/torch_models/lcnn.py

@@ -492,7 +492,7 @@ def __init__(self,
         """
 
         def init_weights(m):
-            if type(m) == nn.Linear:
+            if isinstance(m, nn.Linear):
                 torch.nn.init.xavier_uniform_(m.weight)
 
         model = LCNN(n_occupancy, n_neighbor_sites_list, n_permutation_list,

deepchem/molnet/tests/test_defaults.py

@@ -18,13 +18,13 @@ def test_defaults(self):
         splits = get_defaults("splits")
 
         fkey = next(iter(feats))
-        assert type(fkey) == str
+        assert isinstance(fkey, str)
         assert issubclass(feats[fkey], Featurizer)
 
         tkey = next(iter(trans))
-        assert type(tkey) == str
+        assert isinstance(tkey, str)
         assert issubclass(trans[tkey], Transformer)
 
         skey = next(iter(splits))
-        assert type(skey) == str
+        assert isinstance(skey, str)
         assert issubclass(splits[skey], Splitter)