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9cfa5ce3
编写于
1月 02, 2018
作者:
Y
Yang yaming
提交者:
GitHub
1月 02, 2018
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Merge pull request #7128 from pkuyym/fix-7024
Add doc for lod_rank_table.
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0d4fdce0
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+44
-3
python/paddle/v2/fluid/layers/control_flow.py
python/paddle/v2/fluid/layers/control_flow.py
+44
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python/paddle/v2/fluid/layers/control_flow.py
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9cfa5ce3
...
...
@@ -397,9 +397,50 @@ class While(object):
def
lod_rank_table
(
x
,
level
=
0
):
"""
This function creates an operator for creating a LOD_RANK_TABLE
using the input x.
"""LoD Rank Table Operator. Given an input variable **x** and a level number
of LoD, this layer creates a LodRankTable object. A LoDRankTable object
contains a list of bi-element tuples. Each tuple consists of an index and
a length, both of which are int type. Reffering to specified level of LoD,
the index is the sequence index number and the length representes the
sequence length. Please note that the list is ranked in descending order by
the length. The following is an example:
.. code-block:: text
x is a LoDTensor:
x.lod = [[0, 2, 3],
[0, 5, 6, 7]]
x.data = [a, b, c, d, e, f, g]
1. set level to 0:
Create lod rank table:
lod_rank_table_obj = lod_rank_table(x, level=0)
Get:
lod_rank_table_obj.items() = [(0, 2), (1, 1)]
2. set level to 1:
Create lod rank table:
lod_rank_table_obj = lod_rank_table(x, level=1)
Get:
lod_rank_table_obj.items() = [(0, 5), (1, 1), (2, 1)]
Args:
x (Variable): Input variable, a LoDTensor based which to create the lod
rank table.
level (int): Specify the LoD level, on which to create the lod rank
table.
Returns:
Variable: The created LoDRankTable object.
Examples:
.. code-block:: python
x = fluid.layers.data(name='x', shape=[10],
dtype='float32', lod_level=1)
out = layers.lod_rank_table(x=x, level=0)
"""
helper
=
LayerHelper
(
"lod_rank_table"
,
**
locals
())
table
=
helper
.
create_variable
(
...
...
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