fix doc

Author: chengduoZH

python/paddle/trainer_config_helpers/layers.py

@@ -2722,14 +2722,14 @@ def img_pool_layer(input,
 
  .. math::
 
- w = 1 + int(ceil(input\_width + 2 * padding - pool\_size) / float(stride))
+ w = 1 + int(ceil(input\_width + 2 * padding - pool\_size) / float(stride)) \\\\
  h = 1 + int(ceil(input\_height + 2 * padding\_y - pool\_size\_y) / float(stride\_y))
 
  - ceil_mode=False:
 
  .. math::
 
- w = 1 + int(floor(input\_width + 2 * padding - pool\_size) / float(stride))
+ w = 1 + int(floor(input\_width + 2 * padding - pool\_size) / float(stride)) \\\\
  h = 1 + int(floor(input\_height + 2 * padding\_y - pool\_size\_y) / float(stride\_y))
 
  The example usage is:
@@ -2863,17 +2863,17 @@ def img_pool3d_layer(input,
 
  .. math::
 
- w = 1 + int(ceil(input\_width + 2 * padding - pool\_size) / float(stride))
- h = 1 + int(ceil(input\_height + 2 * padding\_y - pool\_size\_y) / float(stride\_y))
+ w = 1 + int(ceil(input\_width + 2 * padding - pool\_size) / float(stride)) \\\\
+ h = 1 + int(ceil(input\_height + 2 * padding\_y - pool\_size\_y) / float(stride\_y)) \\\\
  d = 1 + int(ceil(input\_depth + 2 * padding\_z - pool\_size\_z) / float(stride\_z))
 
  - ceil_mode=False:
 
  .. math::
 
- w = 1 + int(floor(input\_width + 2 * padding - pool\_size) / float(stride))
- h = 1 + int(floor(input\_height + 2 * padding\_y - pool\_size\_y) / float(stride\_y))
- d = 1 + int(floor(input\_depth + 2 * padding\_z - pool\_size\_z) / float(stride\_z))
+ w = 1 + int(floor(input\_width + 2 * padding - pool\_size) / float(stride)) \\\\
+ h = 1 + int(floor(input\_height + 2 * padding\_y - pool\_size\_y) / float(stride\_y)) \\\\
+ d = 1 + int(floor(input\_depth + 2 * padding\_z - pool\_size\_z) / float(stride\_z)) \\\\
 
  The example usage is:
 
@@ -5429,12 +5429,12 @@ def maxout_layer(input, groups, num_channels=None, name=None, layer_attr=None):
  https://arxiv.org/pdf/1312.6082v4.pdf`_
 
  .. math::
- y_{si+j} = \max_k x_{gsi + sk + j}
- g = groups
- s = input.size / num_channels
- 0 \le i < num_channels / groups
- 0 \le j < s
- 0 \le k < groups
+ y_{si+j} = \max_k x_{gsi + sk + j} \\\\
+ g = groups \\\\
+ s = input.size / num\_channels \\\\
+ 0 \le i < num\_channels / groups \\\\
+ 0 \le j < s \\\\
+ 0 \le k < groups \\\\
 
  The simple usage is: