TapNetClassifierTorch

TapNet classifier in PyTorch.

Quickstart

from sktime.classification.deep_learning.tapnet import TapNetClassifierTorch

estimator = TapNetClassifierTorch(filter_sizes: tuple [int, ... ]=(256, 256, 128), kernel_size: tuple [int, ... ]=(8, 5, 3), layers: tuple [int, ... ]=(500, 300), dropout: float=0.5, lstm_dropout: float=0.8, dilation: int=1, activation: str | Callable | None=None, activation_hidden: str | Callable='LeakyReLU', use_rp: bool=True, rp_group: int=3, rp_alpha: float=2.0, use_att: bool=True, use_lstm: bool=True, use_cnn: bool=True, padding: str='same', init_weights: bool=True, fc_dropout: float=0.0, num_epochs: int=100, batch_size: int=1, optimizer: str | None | Callable='RMSprop', criterion: str | None | Callable='CrossEntropyLoss', callbacks: None | str | tuple [str, ... ]='ReduceLROnPlateau', optimizer_kwargs: dict | None=None, criterion_kwargs: dict | None=None, callback_kwargs: dict | None=None, metrics: None | str | Callable | tuple [str | Callable, ... ]=None, lr: float=0.001, verbose: bool=False, random_state: int=0)

Parameters(29)

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

Number of convolutional filters in each conv block. If use_rp is True, the first conv layer is group-specific and all subsequent conv layers share parameters across groups.

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

Specifying the length of the 1D convolution window.

layerstuple of int, default = (500, 300)

Sizes of dense layers in the mapping section. Any length >= 1 is allowed.

dropoutfloat, default = 0.5

Dropout rate for the convolutional layers.

lstm_dropoutfloat, default = 0.8

Dropout rate for the LSTM layer.

dilationint, default = 1

Dilation value.

activationstr, Callable, or None, default=None

Activation applied to the output layer.

Permitted values:

• None: no activation is applied to the output layer and the network returns raw outputs (logits). This is typically required when using CrossEntropyLoss, which expects logits as input.

• str: name of a class in torch.nn. Case-sensitive names are recommended and must match PyTorch (e.g., "ReLU", "LeakyReLU"). Lowercase aliases for common activations are also accepted (e.g., "relu" is resolved to "ReLU"). The class is instantiated with default constructor arguments. Must be a valid torch.nn activation; see https://pytorch.org/docs/stable/nn.html#non-linear-activations-weighted-sum-nonlinearity

• torch.nn.Module: an instance of a torch.nn.Module subclass, for example torch.nn.ReLU(). Arbitrary callables are not supported.

activation_hiddenstr, Callable, or None, default=”LeakyReLU”

Activation applied to the hidden layers.

Permitted values:

• None: no activation is applied to the hidden layers.

• str: name of a class in torch.nn. Case-sensitive names are recommended and must match PyTorch (e.g., "ReLU", "LeakyReLU"). Lowercase aliases for common activations are also accepted (e.g., "relu" is resolved to "ReLU"). The class is instantiated with default constructor arguments. Must be a valid torch.nn activation; see https://pytorch.org/docs/stable/nn.html#non-linear-activations-weighted-sum-nonlinearity

• torch.nn.Module: an instance of a torch.nn.Module subclass, for example torch.nn.ReLU(). Arbitrary callables are not supported.

use_rpbool, default = True

Whether to use random projections.

rp_groupint, default = 3

Number of random permutation groups g for random dimension permutation (RDP). Must be a positive integer.

rp_alphafloat, default = 2.0

Scale factor alpha used to compute the RDP group size: rp_dim = floor(n_dims * rp_alpha / rp_group). If rp_dim becomes 0, RDP is disabled with a warning (RDP requires multivariate inputs). Must be positive.

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.

paddingstr, default = “same”

Type of padding for convolution layers.

init_weightsbool, default = True

Whether to apply custom initialization.

fc_dropoutfloat, default = 0.0

Dropout rate before the output layer.

num_epochsint, default = 100

The number of epochs to train the model.

batch_sizeint, default = 1

The size of each mini-batch during training.

optimizerstr or None or an instance of optimizers

defined in torch.optim, default = “RMSprop” The optimizer to use for training the model. List of available optimizers: https://pytorch.org/docs/stable/optim.html#algorithms

criterionstr or None or an instance of a loss function

defined in PyTorch, default = “CrossEntropyLoss” The loss function to be used in training the neural network. List of available loss functions: https://pytorch.org/docs/stable/nn.html#loss-functions

callbacksNone or str or a tuple of str, default = “ReduceLROnPlateau”

Learning rate schedulers applied during training. Currently only learning rate schedulers are supported as callbacks. If more than one scheduler is passed, they are applied sequentially in the order they are passed. If None, then no learning rate scheduler is used. Note: Since PyTorch learning rate schedulers need to be initialized with the optimizer object, we only accept the class name (str) of the scheduler here and do not accept an instance of the scheduler. As that can lead to errors and unexpected behavior. List of available learning rate schedulers: https://pytorch.org/docs/stable/optim.html#how-to-adjust-learning-rate

optimizer_kwargsdict or None, default = None

Additional keyword arguments to pass to the optimizer.

criterion_kwargsdict or None, default = None

Additional keyword arguments to pass to the loss function.

callback_kwargsdict or None, default = None

The keyword arguments to be passed to the callbacks.

metricsNone or str or Callable or tuple of str and/or Callable, default = None

Metrics to compute during training. If None, no metrics are computed beyond the loss. Metrics are computed from torchmetrics library. If a string/Callable is passed, it must be one of the metrics defined in https://lightning.ai/docs/torchmetrics/stable/ Examples: “Accuracy”, “F1Score”, “Precision”, “Recall”

lrfloat, default = 0.001

The learning rate to use for the optimizer.

verbosebool, default = False

Whether to print progress information during training.

random_stateint, default = 0

Seed to ensure reproducibility.

Examples

>>> from sktime.classification.deep_learning.tapnet import TapNetClassifierTorch
>>> 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")
>>> clf = TapNetClassifierTorch (num_epochs = 20, batch_size = 4)
>>> clf. fit (X_train, y_train) TapNetClassifierTorch(
... )