brainpy.optim.Momentum#
- class brainpy.optim.Momentum(lr, train_vars=None, momentum=0.9, weight_decay=None, name=None)[source]#
Momentum optimizer.
Momentum [1] is a method that helps accelerate SGD in the relevant direction and dampens oscillations. It does this by adding a fraction \(\gamma\) of the update vector of the past time step to the current update vector:
\[\begin{split}\begin{align} \begin{split} v_t &= \gamma v_{t-1} + \eta \nabla_\theta J( \theta) \\ \theta &= \theta - v_t \end{split} \end{align}\end{split}\]References
Methods
__init__
(lr[, train_vars, momentum, ...])check_grads
(grads)cpu
()Move all variable into the CPU device.
cuda
()Move all variables into the GPU device.
load_state_dict
(state_dict[, warn, compatible])Copy parameters and buffers from
state_dict
into this module and its descendants.load_states
(filename[, verbose])Load the model states.
nodes
([method, level, include_self])Collect all children nodes.
register_implicit_nodes
(*nodes[, node_cls])register_implicit_vars
(*variables[, var_cls])register_train_vars
([train_vars])register_vars
([train_vars])save_states
(filename[, variables])Save the model states.
state_dict
()Returns a dictionary containing a whole state of the module.
to
(device)Moves all variables into the given device.
tpu
()Move all variables into the TPU device.
train_vars
([method, level, include_self])The shortcut for retrieving all trainable variables.
tree_flatten
()Flattens the object as a PyTree.
tree_unflatten
(aux, dynamic_values)Unflatten the data to construct an object of this class.
unique_name
([name, type_])Get the unique name for this object.
update
(grads)vars
([method, level, include_self, ...])Collect all variables in this node and the children nodes.
Attributes
name
Name of the model.