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_ae_fcn.py
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_ae_fcn.py
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"""Deep Learning Auto-Encoder using FCN Network."""
__author__ = ["hadifawaz1999"]
__all__ = ["AEFCNClusterer"]
import gc
import os
import time
from copy import deepcopy
from sklearn.utils import check_random_state
from aeon.clustering.deep_learning.base import BaseDeepClusterer
from aeon.networks import AEFCNNetwork
from aeon.utils.validation._dependencies import _check_soft_dependencies
class AEFCNClusterer(BaseDeepClusterer):
"""Auto-Encoder based Fully Convolutional Network (FCN), as described in [1]_.
Parameters
----------
n_clusters : int, default=None
Number of clusters for the deep learnign model.
clustering_algorithm : str, default="kmeans"
The clustering algorithm used in the latent space.
clustering_params : dict, default=None
Dictionary containing the parameters of the clustering algorithm chosen.
latent_space_dim : int, default=128
Dimension of the latent space of the auto-encoder.
temporal_latent_space : bool, default = False
Flag to choose whether the latent space is an MTS or Euclidean space.
n_layers : int, default = 3
Number of convolution layers.
n_filters : int or list of int, default = [128,256,128]
Number of filters used in convolution layers.
kernel_size : int or list of int, default = [8,5,3]
Size of convolution kernel.
dilation_rate : int or list of int, default = 1
The dilation rate for convolution.
strides : int or list of int, default = 1
The strides of the convolution filter.
padding : str or list of str, default = "same"
The type of padding used for convolution.
activation : str or list of str, default = "relu"
Activation used after the convolution.
use_bias : bool or list of bool, default = True
Whether or not ot use bias in convolution.
n_epochs : int, default = 2000
The number of epochs to train the model.
batch_size : int, default = 16
The number of samples per gradient update.
use_mini_batch_size : bool, default = True,
Whether or not to use the mini batch size formula.
random_state : int or None, default=None
Seed for random number generation.
verbose : boolean, default = False
Whether to output extra information.
loss : string, default="mean_squared_error"
Fit parameter for the keras model.
optimizer : keras.optimizers object, default = Adam(lr=0.01)
Specify the optimizer and the learning rate to be used.
file_path : str, default = "./"
File path to save best model.
save_best_model : bool, default = False
Whether or not to save the best model, if the
modelcheckpoint callback is used by default,
this condition, if True, will prevent the
automatic deletion of the best saved model from
file and the user can choose the file name.
save_last_model : bool, default = False
Whether or not to save the last model, last
epoch trained, using the base class method
save_last_model_to_file.
best_file_name : str, default = "best_model"
The name of the file of the best model, if
save_best_model is set to False, this parameter
is discarded.
last_file_name : str, default = "last_model"
The name of the file of the last model, if
save_last_model is set to False, this parameter
is discarded.
callbacks : keras.callbacks, default = None
List of keras callbacks.
Notes
-----
Adapted from the implementation from Fawaz et. al
https://github.com/hfawaz/dl-4-tsc/blob/master/classifiers/fcn.py
References
----------
.. [1] Zhao et. al, Convolutional neural networks for time series classification,
Journal of Systems Engineering and Electronics, 28(1):2017.
Examples
--------
>>> from aeon.clustering.deep_learning import AEFCNClusterer
>>> from aeon.datasets import load_unit_test
>>> X_train, y_train = load_unit_test(split="train", return_X_y=True)
>>> X_test, y_test = load_unit_test(split="test", return_X_y=True)
>>> aefcn = AEFCNClusterer(n_clusters=2,n_epochs=20,batch_size=4) # doctest: +SKIP
>>> aefcn.fit(X_train) # doctest: +SKIP
AEFCNClusterer(...)
"""
_tags = {
"python_dependencies": "tensorflow",
"capability:multivariate": True,
"algorithm_type": "deeplearning",
}
def __init__(
self,
n_clusters,
clustering_algorithm="kmeans",
clustering_params=None,
latent_space_dim=128,
temporal_latent_space=False,
n_layers=3,
n_filters=None,
kernel_size=None,
dilation_rate=1,
strides=1,
padding="same",
activation="relu",
use_bias=True,
n_epochs=2000,
batch_size=32,
use_mini_batch_size=False,
random_state=0,
verbose=False,
loss="mse",
optimizer="Adam",
file_path="./",
save_best_model=False,
save_last_model=False,
best_file_name="best_model",
last_file_name="last_file",
callbacks=None,
):
_check_soft_dependencies("tensorflow")
super(AEFCNClusterer, self).__init__(
n_clusters=n_clusters,
clustering_algorithm=clustering_algorithm,
clustering_params=clustering_params,
batch_size=batch_size,
last_file_name=last_file_name,
)
self.n_clusters = n_clusters
self.clustering_algorithm = clustering_algorithm
self.clustering_params = clustering_params
self.batch_size = batch_size
self.last_file_name = last_file_name
self.latent_space_dim = latent_space_dim
self.temporal_latent_space = temporal_latent_space
self.n_layers = n_layers
self.n_filters = n_filters
self.kernel_size = kernel_size
self.activation = activation
self.padding = padding
self.strides = strides
self.dilation_rate = dilation_rate
self.use_bias = use_bias
self.optimizer = optimizer
self.loss = loss
self.verbose = verbose
self.use_mini_batch_size = use_mini_batch_size
self.callbacks = callbacks
self.file_path = file_path
self.n_epochs = n_epochs
self.save_best_model = save_best_model
self.save_last_model = save_last_model
self.best_file_name = best_file_name
self.random_state = random_state
self._network = AEFCNNetwork(
latent_space_dim=self.latent_space_dim,
temporal_latent_space=self.temporal_latent_space,
n_layers=self.n_layers,
n_filters=self.n_filters,
kernel_size=self.kernel_size,
dilation_rate=self.dilation_rate,
strides=self.strides,
padding=self.padding,
activation=self.activation,
use_bias=self.use_bias,
random_state=self.random_state,
)
def build_model(self, input_shape, **kwargs):
"""Construct a compiled, un-trained, keras model that is ready for training.
In aeon, time series are stored in numpy arrays of shape
(n_channels,n_timepoints). Keras/tensorflow assume
data is in shape (n_timepoints,n_channels). This method also assumes
(n_timepoints,n_channels). Transpose should happen in fit.
Parameters
----------
input_shape : tuple
The shape of the data fed into the input layer, should be
(n_timepoints,n_channels).
Returns
-------
output : a compiled Keras Model.
"""
import tensorflow as tf
tf.random.set_seed(self.random_state)
encoder, decoder = self._network.build_network(input_shape, **kwargs)
input_layer = tf.keras.layers.Input(input_shape, name="input layer")
encoder_output = encoder(input_layer)
decoder_output = decoder(encoder_output)
output_layer = tf.keras.layers.Reshape(
target_shape=input_shape, name="outputlayer"
)(decoder_output)
model = tf.keras.models.Model(inputs=input_layer, outputs=output_layer)
self.optimizer_ = (
tf.keras.optimizers.Adam() if self.optimizer is None else self.optimizer
)
model.compile(optimizer=self.optimizer_, loss=self.loss)
return model
def _fit(self, X):
"""Fit the classifier on the training set (X, y).
Parameters
----------
X : np.ndarray of shape = (n_instances (n), n_channels (d), n_timepoints (m))
The training input samples.
Returns
-------
self : object
"""
import tensorflow as tf
# Transpose to conform to Keras input style.
X = X.transpose(0, 2, 1)
check_random_state(self.random_state)
self.input_shape = X.shape[1:]
self.training_model_ = self.build_model(self.input_shape)
if self.verbose:
self.training_model_.summary()
if self.use_mini_batch_size:
mini_batch_size = min(self.batch_size, X.shape[0] // 10)
else:
mini_batch_size = self.batch_size
self.file_name_ = (
self.best_file_name if self.save_best_model else str(time.time_ns())
)
self.callbacks_ = (
[
tf.keras.callbacks.ReduceLROnPlateau(
monitor="loss", factor=0.5, patience=50, min_lr=0.0001
),
tf.keras.callbacks.ModelCheckpoint(
filepath=self.file_path + self.file_name_ + ".hdf5",
monitor="loss",
save_best_only=True,
),
]
if self.callbacks is None
else self.callbacks
)
self.history = self.training_model_.fit(
X,
X,
batch_size=mini_batch_size,
epochs=self.n_epochs,
verbose=self.verbose,
callbacks=self.callbacks_,
)
try:
self.model_ = tf.keras.models.load_model(
self.file_path + self.file_name_ + ".hdf5", compile=False
)
if not self.save_best_model:
os.remove(self.file_path + self.file_name_ + ".hdf5")
except FileNotFoundError:
self.model_ = deepcopy(self.training_model_)
self._fit_clustering(X=X)
gc.collect()
return self
def _score(self, X, y=None):
# Transpose to conform to Keras input style.
X = X.transpose(0, 2, 1)
latent_space = self.model_.layers[1].predict(X)
return self.clusterer.score(latent_space)
@classmethod
def get_test_params(cls, parameter_set="default"):
"""Return testing parameter settings for the estimator.
Parameters
----------
parameter_set : str, default="default"
Name of the set of test parameters to return, for use in tests. If no
special parameters are defined for a value, will return `"default"` set.
For classifiers, a "default" set of parameters should be provided for
general testing, and a "results_comparison" set for comparing against
previously recorded results if the general set does not produce suitable
probabilities to compare against.
Returns
-------
params : dict or list of dict, default={}
Parameters to create testing instances of the class.
Each dict are parameters to construct an "interesting" test instance, i.e.,
`MyClass(**params)` or `MyClass(**params[i])` creates a valid test instance.
`create_test_instance` uses the first (or only) dictionary in `params`.
"""
param1 = {
"n_clusters": 2,
"n_epochs": 1,
"batch_size": 4,
"use_bias": False,
"n_layers": 1,
"padding": "same",
"strides": 1,
"clustering_params": {
"distance": "euclidean",
"averaging_method": "mean",
"n_init": 1,
"max_iter": 30,
},
}
test_params = [param1]
return test_params