brainpy.nn.operations.fb_connect#

brainpy.nn.operations.fb_connect(senders, receivers, inplace=False, name=None, need_detect_cycle=True)[source]#

Create a feedback connection from sender node to receiver node. Feedbacks nodes will be called at runtime using data from the previous call.

You can also perform this operation using the << operator.

Which means that a feedback connection is now created between node1 and node2. In other words, the forward function of node1 depends on the previous output of node2:

\[\mathrm{node1}(x_t) = \mathrm{node1}(x_t, \mathrm{node2}(x_{t - 1}))\]

You can also use this function to define feedback:

node1 = fb_connect(node1, node2)
# without copy (node1 is the same object throughout)
node1 = fb_connect(node1, node2, inplace=True, name="n1_copy")
Parameters

  • receivers (Node) – Node receiving feedback.

  • senders (GenericNode) – Node or Network sending feedback

  • inplace (bool, defaults to False) – If True, then the function returns a copy of node.

  • name (str, optional) – Name of the copy of node if inplace is True.

  • need_detect_cycle (bool) – Whether we need to detect cycles in the defined network.

Returns

A network with feedback connections.

Return type

Network