fix ops bug

Author: hanjr92

tensorlayerx/backend/ops/mindspore_backend.py

@@ -68,7 +68,7 @@ def set_context(**kwargs):
 
 
 def get_tensor_shape(x):
-    return list(P.Shape()(x))
+    return list(x.shape)
 
 
 # initializers

tensorlayerx/backend/ops/paddle_backend.py

@@ -83,7 +83,7 @@ def set_context(**kwargs):
 
 
 def get_tensor_shape(x):
-    return pd.shape(x)
+    return list(x.shape)
 
 
 # initializers
@@ -1213,6 +1213,8 @@ def floor(x):
 def gather(params, indices, axis=None):
     if axis < 0:
         axis = len(params.shape) + axis
+    if axis is None:
+        axis = 0
     return pd.gather(params, indices, axis)