!13459 Add example for ngram

From: @ezphlow
Reviewed-by: @heleiwang,@liucunwei
Signed-off-by: @liucunwei

mindspore/dataset/text/transforms.py

@@ -299,7 +299,11 @@ class Ngram(TextTensorOperation):
             (default=None, which will use whitespace as separator).
 
     Examples:
-        >>> ngram_op = text.Ngram(3, separator="")
+        >>> ngram_op = text.Ngram(3, separator="-")
+        >>> output = ngram_op(["WildRose Country", "Canada's Ocean Playground", "Land of Living Skies"])
+        >>> # output
+        >>> # ["WildRose Country-Canada's Ocean Playground-Land of Living Skies"]
+        >>> # same ngram_op called through map
         >>> text_file_dataset = text_file_dataset.map(operations=ngram_op)
     """
 

mindspore/dataset/transforms/c_transforms.py

@@ -172,7 +172,7 @@ class Slice(cde.SliceOp):
             2.  :py:obj:`list(int)`: Slice these indices along the first dimension. Negative indices are supported.
             3.  :py:obj:`slice`: Slice the generated indices from the slice object along the first dimension.
                 Similar to start:stop:step.
-            4.  :py:obj:`None`: Slice the whole dimension. Similar to :py:obj:`:` in Python indexing.
+            4.  :py:obj:`None`: Slice the whole dimension. Similar to :py:obj:`[:]' in Python indexing.
             5.  :py:obj:`Ellipsis`: Slice the whole dimension, same result with `None`.
 
     Examples:

mindspore/dataset/vision/c_transforms.py

@@ -1118,6 +1118,8 @@ class RandomRotation(ImageTensorOperation):
             degrees = degrees % 360
         if isinstance(degrees, (list, tuple)):
             degrees = [degrees[0] % 360, degrees[1] % 360]
+            if degrees[0] > degrees[1]:
+                degrees[1] += 360
 
         self.degrees = degrees
         self.resample = resample

tests/ut/cpp/dataset/common/common.h

@@ -20,8 +20,8 @@
 #include "include/api/status.h"
 #include "include/api/types.h"
 #include "minddata/dataset/core/tensor_shape.h"
-#include "minddata/dataset/core/type_id.h"
 #include "minddata/dataset/core/de_tensor.h"
+#include "minddata/dataset/core/type_id.h"
 #include "utils/log_adapter.h"
 
 using mindspore::Status;