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_cnn.py
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_cnn.py
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"""Time Convolutional Neural Network (CNN) for regression."""
__author__ = ["AurumnPegasus", "achieveordie", "hadifawaz1999"]
__all__ = ["CNNRegressor"]
import gc
import os
import time
from copy import deepcopy
from sklearn.utils import check_random_state
from aeon.networks import CNNNetwork
from aeon.regression.deep_learning.base import BaseDeepRegressor
from aeon.utils.validation._dependencies import _check_soft_dependencies
class CNNRegressor(BaseDeepRegressor):
"""Time Series Convolutional Neural Network (CNN).
Adapted from the implementation used in [1]_.
Parameters
----------
n_layers : int, default = 2,
the number of convolution layers in the network
kernel_size : int or list of int, default = 7,
kernel size of convolution layers, if not a list, the same kernel size
is used for all layer, len(list) should be n_layers
n_filters : int or list of int, default = [6, 12],
number of filters for each convolution layer, if not a list, the same n_filters
is used in all layers.
avg_pool_size : int or list of int, default = 3,
the size of the average pooling layer, if not a list, the same
max pooling size is used
for all convolution layer
output_activation : str, default = "linear",
the output activation for the regressor
activation : str or list of str, default = "sigmoid",
keras activation function used in the model for each layer,
if not a list, the same
activation is used for all layers
padding : str or list of str, default = 'valid',
the method of padding in convolution layers, if not a list,
the same padding used
for all convolution layers
strides : int or list of int, default = 1,
the strides of kernels in the convolution and max pooling layers,
if not a list, the same strides are used for all layers
dilation_rate : int or list of int, default = 1,
the dilation rate of the convolution layers, if not a list,
the same dilation rate is used all over the network
use_bias : bool or list of bool, default = True,
condition on whether or not to use bias values for convolution layers,
if not a list, the same condition is used for all layers
random_state : int, default = 0
seed to any needed random actions
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.
verbose : boolean, default = False
whether to output extra information
loss : string, default="mean_squared_error"
fit parameter for the keras model
optimizer : keras.optimizer, default=keras.optimizers.Adam(),
metrics : list of strings, default=["accuracy"],
callbacks : keras.callbacks, default=model_checkpoint to save best
model on training loss
file_path : file_path for the best model (if checkpoint is used as callback)
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
Notes
-----
Adapted from the implementation from Fawaz et. al
https://github.com/hfawaz/dl-4-tsc/blob/master/classifiers/cnn.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.regression.deep_learning import CNNRegressor
>>> from aeon.datasets import make_example_3d_numpy
>>> X, y = make_example_3d_numpy(n_cases=10, n_channels=1, n_timepoints=12,
... return_y=True, regression_target=True,
... random_state=0)
>>> rgs = CNNRegressor(n_epochs=20, bacth_size=4) # doctest: +SKIP
>>> rgs.fit(X, y) # doctest: +SKIP
CNNRegressor(...)
"""
def __init__(
self,
n_layers=2,
kernel_size=7,
n_filters=None,
avg_pool_size=3,
activation="sigmoid",
padding="valid",
strides=1,
dilation_rate=1,
n_epochs=2000,
batch_size=16,
callbacks=None,
file_path="./",
save_best_model=False,
save_last_model=False,
best_file_name="best_model",
last_file_name="last_model",
verbose=False,
loss="mse",
output_activation="linear",
metrics=None,
random_state=None,
use_bias=True,
optimizer=None,
):
_check_soft_dependencies("tensorflow")
super(CNNRegressor, self).__init__(
batch_size=batch_size,
)
self.n_layers = n_layers
self.avg_pool_size = avg_pool_size
self.padding = padding
self.n_filters = n_filters
self.kernel_size = kernel_size
self.file_path = file_path
self.save_best_model = save_best_model
self.save_last_model = save_last_model
self.best_file_name = best_file_name
self.last_file_name = last_file_name
self.strides = strides
self.dilation_rate = dilation_rate
self.callbacks = callbacks
self.n_epochs = n_epochs
self.batch_size = batch_size
self.verbose = verbose
self.loss = loss
self.output_activation = output_activation
self.metrics = metrics
self.random_state = random_state
self.activation = activation
self.use_bias = use_bias
self.optimizer = optimizer
self.history = None
self._network = CNNNetwork(
n_layers=self.n_layers,
kernel_size=self.kernel_size,
n_filters=self.n_filters,
avg_pool_size=self.avg_pool_size,
activation=self.activation,
padding=self.padding,
strides=self.strides,
dilation_rate=self.dilation_rate,
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 (d,m), where d
is the number of dimensions, m is the series length. Keras/tensorflow assume
data is in shape (m,d). This method also assumes (m,d). Transpose should
happen in fit.
Parameters
----------
input_shape : tuple
The shape of the data fed into the input layer, should be (m,d)
Returns
-------
output : a compiled Keras Model
"""
import tensorflow as tf
from tensorflow import keras
tf.random.set_seed(self.random_state)
input_layer, output_layer = self._network.build_network(input_shape, **kwargs)
output_layer = keras.layers.Dense(units=1, activation=self.output_activation)(
output_layer
)
self.optimizer_ = (
keras.optimizers.Adam() if self.optimizer is None else self.optimizer
)
model = keras.models.Model(inputs=input_layer, outputs=output_layer)
model.compile(
loss=self.loss,
optimizer=self.optimizer_,
metrics=self.metrics,
)
return model
def _fit(self, X, y):
"""Fit the regressor on the training set (X, y).
Parameters
----------
X : np.ndarray of shape = (n_instances (n), n_channels (d), series_length (m))
The training input samples.
y : np.ndarray of shape n
The training data target values.
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()
self.file_name_ = (
self.best_file_name if self.save_best_model else str(time.time_ns())
)
self.callbacks_ = (
[
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,
y,
batch_size=self.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_)
if self.save_last_model:
self.save_last_model_to_file(file_path=self.file_path)
gc.collect()
return self
@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 regressors, 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`.
"""
param = {
"n_epochs": 10,
"batch_size": 4,
"avg_pool_size": 4,
}
return [param]