fix params with only 1 dim (#15828)

* fix params with only 1 dim
* test=develop

python/paddle/fluid/io.py

@@ -766,7 +766,10 @@ def _load_distributed_persistables(executor, dirname, main_program=None):
                     dtype=slice_var.dtype,
                     persistable=True)
 
-                dim1_flatten = reduce(lambda x, y: x * y, slice.shape[1:])
+                dim1_flatten = 1
+                if len(slice.shape) >= 2:
+                    dim1_flatten = reduce(lambda x, y: x * y, slice.shape[1:])
+
                 start = int(offset / dim1_flatten)
                 end = int(offset / dim1_flatten + slice.shape[0])
 

python/paddle/fluid/transpiler/distribute_transpiler.py

@@ -1020,7 +1020,11 @@ class DistributeTranspiler(object):
         skip_dim0 = 0
         slice_vars = self.param_var_mapping[orig_var_name]
 
-        orig_dim1_flatten = reduce(lambda x, y: x * y, slice_vars[0].shape[1:])
+        orig_dim1_flatten = 1
+
+        if len(slice_vars[0].shape) >= 2:
+            orig_dim1_flatten = reduce(lambda x, y: x * y,
+                                       slice_vars[0].shape[1:])
 
         for slice_var in slice_vars[:block_idx]:
             skip_dim0 += slice_var.shape[0]