Cleanup dataset UT: use md5 npz in test_zip for images

tests/ut/python/dataset/test_decode.py

@@ -20,16 +20,13 @@ import mindspore.dataset.transforms.vision.c_transforms as vision
 import numpy as np
 import mindspore.dataset as ds
 from mindspore import log as logger
+from util import diff_mse
+
 
 DATA_DIR = ["../data/dataset/test_tf_file_3_images/train-0000-of-0001.data"]
 SCHEMA_DIR = "../data/dataset/test_tf_file_3_images/datasetSchema.json"
 
 
-def diff_mse(in1, in2):
-    mse = (np.square(in1.astype(float) / 255 - in2.astype(float) / 255)).mean()
-    return mse * 100
-
-
 def test_decode_op():
     """
     Test Decode op

tests/ut/python/dataset/test_zip.py

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # ==============================================================================
-from util import save_and_check_dict
+from util import save_and_check_dict, save_and_check_md5
 from mindspore import log as logger
 
 import mindspore.dataset as ds
@@ -58,7 +58,7 @@ def test_zip_02():
     dataz = ds.zip((data1, data2))
     # Note: zipped dataset has 3 rows and 4 columns
     filename = "zip_02_result.npz"
-    save_and_check_dict(dataz, filename, generate_golden=GENERATE_GOLDEN)
+    save_and_check_md5(dataz, filename, generate_golden=GENERATE_GOLDEN)
 
 
 def test_zip_03():
@@ -72,7 +72,7 @@ def test_zip_03():
     dataz = ds.zip((data1, data2))
     # Note: zipped dataset has 3 rows and 7 columns
     filename = "zip_03_result.npz"
-    save_and_check_dict(dataz, filename, generate_golden=GENERATE_GOLDEN)
+    save_and_check_md5(dataz, filename, generate_golden=GENERATE_GOLDEN)
 
 
 def test_zip_04():
@@ -87,7 +87,7 @@ def test_zip_04():
     dataz = ds.zip((data1, data2, data3))
     # Note: zipped dataset has 3 rows and 9 columns
     filename = "zip_04_result.npz"
-    save_and_check_dict(dataz, filename, generate_golden=GENERATE_GOLDEN)
+    save_and_check_md5(dataz, filename, generate_golden=GENERATE_GOLDEN)
 
 
 def test_zip_05():