fix f class on OrangePi (#2216)

Author: lvyufeng

mindtorch/ops/array.py

@@ -765,7 +765,10 @@ def _slice_helper(tensor, slice_spec, do_update=False, updates=None):
                 begin.append(0)
                 begin_mask |= (1 << index)
             if s.stop is not None:
-                end.append(s.stop)
+                stop = s.stop
+                if stop == -1:
+                    stop = tensor.shape[index]
+                end.append(stop)
             else:
                 end.append(0)
                 end_mask |= (1 << index)

mindtorch/ops/creation.py

@@ -114,6 +114,7 @@ def arange(start=0, end=None, step=1, *, out=None, dtype=None, layout=None, devi
     start = start.item() if isinstance(start, (mindtorch.Tensor, np.integer)) else start
     end = end.item() if isinstance(end, (mindtorch.Tensor, np.integer)) else end
     step = step.item() if isinstance(step, (mindtorch.Tensor, np.integer)) else step
+    step = type(start)(step)
 
     output = execute('arange', start, end, step, dtype, device=device)
     if out is None: