fix pad input dims less than padding

.jenkins/check/config/whitelizard.txt

@@ -28,6 +28,8 @@ mindspore/model_zoo/official/recommend/wide_and_deep_multitable/src/wide_and_dee
 mindspore/mindspore/ccsrc/pipeline/jit/resource.cc:mindspore::pipeline::GetMethodMap
 mindspore/mindspore/python/mindspore/ops/operations/array_ops.py:_compute_slicing_shape
 mindspore/mindspore/python/mindspore/ops/function/array_func.py:scatter_nd
+mindspore/mindspore/python/mindspore/ops/function/nn_func.py:max_unpool3d
+mindspore/mindspore/python/mindspore/ops/function/nn_func.py:pad
 mindspore/mindspore/python/mindspore/context.py:set_auto_parallel_context
 mindspore/mindspore/python/mindspore/common/tensor.py:__init__
 mindspore/mindspore/python/mindspore/common/parameter.py:set_data

mindspore/python/mindspore/ops/function/nn_func.py

@@ -2490,6 +2490,7 @@ def pad(input_x, padding, mode='constant', value=None):
     if not isinstance(padding, Tensor):
         _check_pad_inputs(padding)
         padding = Tensor(padding)
+    is_expand = False
     if mode == "constant":
         value = 0 if value is None else value
         if isinstance(value, (float, int)):
@@ -2499,7 +2500,12 @@ def pad(input_x, padding, mode='constant', value=None):
             raise ValueError(f"For 'pad', the padding mode '{mode}' can not set value, but got value {value}.")
         if mode == "replicate":
             mode = "edge"
+        if padding.shape[0] == input_x.ndim + 1:
+            input_x = input_x.expand_dims(0)
+            is_expand = True
     out = PadV3(mode=mode, paddings_contiguous=True)(input_x, padding, value)
+    if is_expand:
+        out = out.squeeze(0)
     return out