neon.layers.layer.Activation

class neon.layers.layer.Activation(transform, name=None)[source]

Bases: neon.layers.layer.Layer

A layer that applies a specified transform to the inputs and produces outputs of the same shape.

Generally used to implemenent nonlinearities for layer post activations.

Parameters:
  • transform (Transform) – a transform object with fprop and bprop functions to apply
  • name (str, optional) – Layer name. Defaults to “ActivationLayer”
__init__(transform, name=None)[source]

Methods

__init__(transform[, name])
accumulates(f) Higher order decorator function that enables accumulation functionality for that function.
allocate([shared_outputs]) Allocate output buffer to store activations from fprop.
allocate_deltas(global_deltas)
bprop(error) Apply the backward pass transformation to the input data.
configure(in_obj) Sets shape based parameters of this layer given an input tuple or int or input layer.
fprop(inputs[, inference]) Apply the forward pass transformation to the input data.
gen_class(pdict)
get_description(**kwargs)
get_is_mklop()
get_param_attrs()
get_terminal() Used for recursively getting final nodes from layer containers.
load_weights(pdict[, load_states]) Load weights.
nested_str([level]) Utility function for displaying layer info with a given indentation level.
recursive_gen(pdict, key) helper method to check whether the definition
serialize() Get state parameters for this layer.
set_acc_on(acc_on) Set the acc_on flag according to bool argument.
set_batch_size(N) Set minibatch size.
set_deltas(delta_buffers) Use pre-allocated (by layer containers) list of buffers for backpropagated error.
set_is_mklop()
set_next(layer) Set next_layer to provided layer.
set_not_mklop()
set_params(pdict)
set_seq_len(S) Set sequence length.
set_states(pdict)
accumulates(f)

Higher order decorator function that enables accumulation functionality for that function. Object that use this decorator are required to have an acc_param attribute. This attribute tuple declares the names for existing temp parameter and real parameter buffers. The temp parameter buffer copies the value of the parameter buffer before f is called, and after f is called the temp and normal buffers are summed. This decorator could be used to wrap any function that may want to accumulate parameters instead of overwriting.

allocate(shared_outputs=None)

Allocate output buffer to store activations from fprop. Don’t reallocate if it already exists. Only allocate space if layer owns its own output (e.g., bias and activation work in place, so do not own their output). Outputs can be allocated from a pre-allocated pool if shared_outputs is provided.

Parameters:shared_outputs (Tensor, optional) – pre-allocated tensor for activations to be computed into
allocate_deltas(global_deltas)
be = None
bprop(error)[source]

Apply the backward pass transformation to the input data.

Parameters:error (Tensor) – deltas back propagated from the adjacent higher layer
Returns:deltas to propagate to the adjacent lower layer
Return type:Tensor
classnm

Returns the class name.

configure(in_obj)[source]

Sets shape based parameters of this layer given an input tuple or int or input layer.

Parameters:in_obj (int, tuple, Layer or Tensor) – object that provides shape information for layer
Returns:shape of output data
Return type:(tuple)
fprop(inputs, inference=False)[source]

Apply the forward pass transformation to the input data.

Parameters:
  • inputs (Tensor) – input data
  • inference (bool) – is inference only
Returns:

output data

Return type:

Tensor

gen_class(pdict)
get_description(**kwargs)
get_is_mklop()[source]
get_param_attrs()
get_terminal()

Used for recursively getting final nodes from layer containers.

load_weights(pdict, load_states=True)

Load weights.

Parameters:
  • pdict
  • load_states – (Default value = True)
modulenm

Returns the full module path.

nested_str(level=0)

Utility function for displaying layer info with a given indentation level.

Parameters:level (int, optional) – indentation level
Returns:layer info at the given indentation level
Return type:str
recursive_gen(pdict, key)

helper method to check whether the definition dictionary is defining a NervanaObject child, if so it will instantiate that object and replace the dictionary element with an instance of that object

serialize()

Get state parameters for this layer.

Returns:whatever data this model wants to receive in order to restore state
Return type:varies
set_acc_on(acc_on)

Set the acc_on flag according to bool argument. If set to true, the layer will accumulate some (preset) parameters on calls to functions that are decorated with the accumulates decorator. In order to use this feature, accumulate_updates=True must have been passed to the layer’s allocate function

This currently only works for a few hard coded parameters in select layers

Parameters:acc_on (bool) – Value to set the acc_on flag to.
set_batch_size(N)

Set minibatch size.

Parameters:N (int) – minibatch size
set_deltas(delta_buffers)

Use pre-allocated (by layer containers) list of buffers for backpropagated error. Only set deltas for layers that own their own deltas Only allocate space if layer owns its own deltas (e.g., bias and activation work in-place, so do not own their deltas).

Parameters:delta_buffers (DeltasTree) – list of pre-allocated tensors (provided by layer container)
set_is_mklop()
set_next(layer)

Set next_layer to provided layer.

Parameters:layer (layer) – Next layer
set_not_mklop()
set_params(pdict)
set_seq_len(S)

Set sequence length.

Parameters:S (int) – sequence length
set_states(pdict)