From 54a85b7bfd1836585ed6f257ed67651e0d516557 Mon Sep 17 00:00:00 2001
From: dragonwarrior <dra120126@163.com>
Date: Mon, 26 Mar 2018 13:24:10 +0800
Subject: [PATCH] Add lrn layer (#9157)

* add LRN layer for fluid

* add LRN layer for fluid

* add documentation for LRN layer

* add paper reference for LRN layer

* add seperate documentation for LRN layer

* rm lrn.py in doc/fluid/dev/src

* change code style in lrn

* fix style of comments in lrn
---
 python/paddle/fluid/layers/nn.py              | 71 +++++++++++++++++++
 .../fluid/tests/unittests/test_layers.py      |  7 ++
 2 files changed, 78 insertions(+)

diff --git a/python/paddle/fluid/layers/nn.py b/python/paddle/fluid/layers/nn.py
index 679de6ce2aa..2db4e5d27d4 100644
--- a/python/paddle/fluid/layers/nn.py
+++ b/python/paddle/fluid/layers/nn.py
@@ -74,6 +74,7 @@ __all__ = [
     'one_hot',
     'autoincreased_step_counter',
     'lod_reset',
+    'lrn',
 ]
 
 
@@ -3410,3 +3411,73 @@ def lod_reset(x, y=None, target_lod=None):
         raise ValueError("y and target_lod should not be both None.")
 
     return out
+
+
+def lrn(input, n=5, k=1.0, alpha=1e-4, beta=0.75, name=None):
+    """
+    Local Response Normalization Layer. This layer performs a type of
+    "lateral inhibition" by normalizing over local input regions.
+
+    The formula is as follows:
+
+    .. math::
+
+        Output(i, x, y) = Input(i, x, y) / \left(
+        k + \alpha \sum\limits^{\min(C, c + n/2)}_{j = \max(0, c - n/2)}
+        (Input(j, x, y))^2 \right)^{\beta}
+
+    In the above equation:
+
+    * :math:`n`: The number of channels to sum over.
+    * :math:`k`: The offset (avoid being divided by 0).
+    * :math:`alpha`: The scaling parameter.
+    * :math:`beta`: The exponent parameter.
+
+    Refer to `ImageNet Classification with Deep Convolutional Neural Networks
+    <https://papers.nips.cc/paper/4824-imagenet-classification-with-deep-convolutional-neural-networks.pdf>`_
+
+    Args:
+        input (Variable): The input tensor of this layer, and the dimension of input tensor must be 4.
+        n (int, default 5): The number of channels to sum over.
+        k (float, default 1.0): An offset (usually positive to avoid dividing by 0).
+        alpha (float, default 1e-4): The scaling parameter.
+        beta (float, default 0.75): The exponent.
+        name (str, default None): A name for this operation.
+
+    Raises:
+        ValueError: If rank of the input tensor is not 4.
+
+    Returns:
+        A tensor variable storing the transformation result.
+
+    Examples:
+        .. code-block:: python
+
+          data = fluid.layers.data(name="data", shape=[3, 112, 112], dtype="float32")
+          lrn = fluid.layers.lrn(input=data)
+    """
+    helper = LayerHelper('lrn', **locals())
+    dtype = helper.input_dtype()
+    input_shape = input.shape
+    dims = len(input_shape)
+
+    if dims != 4:
+        raise ValueError(
+            "dims of input must be 4(not %d), and it's order must be NCHW" %
+            (dims))
+
+    mid_out = helper.create_tmp_variable(dtype=dtype, stop_gradient=True)
+    lrn_out = helper.create_tmp_variable(dtype)
+    helper.append_op(
+        type="lrn",
+        inputs={"X": input},
+        outputs={
+            "Out": lrn_out,
+            "MidOut": mid_out,
+        },
+        attrs={"n": n,
+               "k": k,
+               "alpha": alpha,
+               "beta": beta})
+
+    return lrn_out
diff --git a/python/paddle/fluid/tests/unittests/test_layers.py b/python/paddle/fluid/tests/unittests/test_layers.py
index b5fd59cf3a1..2179826d81f 100644
--- a/python/paddle/fluid/tests/unittests/test_layers.py
+++ b/python/paddle/fluid/tests/unittests/test_layers.py
@@ -231,6 +231,13 @@ class TestBook(unittest.TestCase):
             self.assertIsNotNone(layers.softmax(hid))
         print(str(program))
 
+    def test_lrn(self):
+        program = Program()
+        with program_guard(program):
+            data = layers.data(name='data', shape=[6, 2, 2], dtype='float32')
+            self.assertIsNotNone(layers.lrn(data))
+        print(str(program))
+
     def test_get_places(self):
         program = Program()
         with program_guard(program):
-- 
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