TapNetClassifier

TapNetClassifier

class TapNetClassifier(n_epochs=2000, batch_size=16, dropout=0.5, filter_sizes=(256, 256, 128), kernel_size=(8, 5, 3), dilation=1, layers=(500, 300), use_rp=True, rp_params=(-1, 3), activation='sigmoid', activation_hidden='leaky_relu', use_bias=True, use_att=True, use_lstm=True, use_cnn=True, random_state=None, padding='same', loss='binary_crossentropy', optimizer=None, metrics=None, callbacks=None, verbose=False, lstm_dropout=0.8)[source]

Time series attentional prototype network (TapNet), as described in [1].

Parameters:

filter_sizesarray of int, default = (256, 256, 128)

sets the kernel size argument for each convolutional block. Controls number of convolutional filters and number of neurons in attention dense layers.

kernel_sizesarray of int, default = (8, 5, 3)

controls the size of the convolutional kernels

layersarray of int, default = (500, 300)

size of dense layers

reductionint, default = 16

divides the number of dense neurons in the first layer of the attention block.

n_epochsint, default = 2000

number of epochs to train the model

batch_sizeint, default = 16

number of samples per update

callbackslist of keras.callbacks.Callback, optional (default=None)

List of Keras callbacks to apply during model training.

dropoutfloat, default = 0.5

dropout rate, in the range [0, 1)

lstm_dropoutfloat, default = 0.8

dropout rate for the LSTM layer, in the range [0, 1)

dilationint, default = 1

dilation value

activationstr, default = “sigmoid”

activation function for the last output layer List of available activation functions: https://keras.io/api/layers/activations/

activation_hiddenstr, default = “leaky_relu”

activation function for the hidden layers List of available activation functions: https://keras.io/api/layers/activations/

lossstr, default = “binary_crossentropy”

loss function for the classifier

optimizerstr or None, default = “Adam(lr=0.01)”

gradient updating function for the classifier

use_biasbool, default = True

whether to use bias in the output dense layer

use_rpbool, default = True

whether to use random projections

use_attbool, default = True

whether to use self attention

use_lstmbool, default = True

whether to use an LSTM layer

use_cnnbool, default = True

whether to use a CNN layer

verbosebool, default = False

whether to output extra information

random_stateint or None, default = None

seed for random

Attributes:

n_classesint

number of classes extracted from the data

References

[1]

Zhang et al. Tapnet: Multivariate time series classification with

attentional prototypical network, Proceedings of the AAAI Conference on Artificial Intelligence 34(4), 6845-6852, 2020

Examples

>>> from sktime.classification.deep_learning.tapnet import TapNetClassifier
>>> from sktime.datasets import load_unit_test
>>> X_train, y_train = load_unit_test(split="train")
>>> X_test, y_test = load_unit_test(split="test")
>>> tapnet = TapNetClassifier(n_epochs=20,batch_size=4)
>>> tapnet.fit(X_train, y_train)
TapNetClassifier(...)

Methods

build_model(input_shape, n_classes, **kwargs)	Construct a complied, un-trained, keras model that is ready for training.
check_is_fitted([method_name])	Check if the estimator has been fitted.
clone()	Obtain a clone of the object with same hyper-parameters and config.
clone_tags(estimator[, tag_names])	Clone tags from another object as dynamic override.
create_test_instance([parameter_set])	Construct an instance of the class, using first test parameter set.
create_test_instances_and_names([parameter_set])	Create list of all test instances and a list of names for them.
fit(X, y)	Fit time series classifier to training data.
fit_predict(X, y[, cv, change_state])	Fit and predict labels for sequences in X.
fit_predict_proba(X, y[, cv, change_state])	Fit and predict labels probabilities for sequences in X.
get_class_tag(tag_name[, tag_value_default])	Get class tag value from class, with tag level inheritance from parents.
get_class_tags()	Get class tags from class, with tag level inheritance from parent classes.
get_config()	Get config flags for self.
get_fitted_params([deep])	Get fitted parameters.
get_param_defaults()	Get object's parameter defaults.
get_param_names([sort])	Get object's parameter names.
get_params([deep])	Get a dict of parameters values for this object.
get_tag(tag_name[, tag_value_default, ...])	Get tag value from instance, with tag level inheritance and overrides.
get_tags()	Get tags from instance, with tag level inheritance and overrides.
get_test_params([parameter_set])	Return testing parameter settings for the estimator.
is_composite()	Check if the object is composed of other BaseObjects.
load_from_path(serial)	Load object from file location.
load_from_serial(serial)	Load object from serialized memory container.
predict(X)	Predicts labels for sequences in X.
predict_proba(X)	Predicts labels probabilities for sequences in X.
reset()	Reset the object to a clean post-init state.
save([path, serialization_format])	Save serialized self to bytes-like object or to (.zip) file.
score(X, y)	Scores predicted labels against ground truth labels on X.
set_config(**config_dict)	Set config flags to given values.
set_params(**params)	Set the parameters of this object.
set_random_state([random_state, deep, ...])	Set random_state pseudo-random seed parameters for self.
set_tags(**tag_dict)	Set instance level tag overrides to given values.
summary()	Summary function to return the losses/metrics for model fit.