class_docstr: Global Context Block implementation.
  
  Args:
      in_channels (int): The input channels of Global Context Block.
      ratio (float): The channels of attention map.
class_docstr_tok: ["Global","Context","Block","implementation",".","Args",":","in_channels","(","int",")",":","The","input","channels","of","Global","Context","Block",".","ratio","(","float",")",":","The","channels","of","attention","map","."]
code: def forward(self, x):
      context = self.global_context_block(x)
      channel_add_term = self.channel_add_conv(context)
      out = x + channel_add_term
      return out
  
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddleseg.cvlibs import manager
  from paddleseg.models import layers
  from paddleseg.utils import utils
label_desc: Use image node_id 3 for calling the GlobalContextBlock obj's underlying member method code with example usage: obj.forward(x) and returns: out