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keras (version 2.2.4)

R Interface to 'Keras'

Description

Interface to 'Keras' , a high-level neural networks 'API'. 'Keras' was developed with a focus on enabling fast experimentation, supports both convolution based networks and recurrent networks (as well as combinations of the two), and runs seamlessly on both 'CPU' and 'GPU' devices.

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install.packages('keras')

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Version

2.2.4

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MIT + file LICENSE

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Last Published

November 22nd, 2018

Functions in keras (2.2.4)

Base R6 class for Keras callbacks

callback_learning_rate_scheduler

Learning rate scheduler.

Weight constraints

Count the total number of scalars composing the weights.

dataset_reuters

Reuters newswire topics classification

evaluate.keras.engine.training.Model

Evaluate a Keras model

Freeze and unfreeze weights

Retrieve the next item from a generator

Retrieve tensors for layers with multiple nodes

Retrieves a layer based on either its name (unique) or index.

initializer_glorot_uniform

Glorot uniform initializer, also called Xavier uniform initializer.

initializer_he_normal

He normal initializer.

initializer_ones

Initializer that generates tensors initialized to 1.

application_mobilenet

MobileNet model architecture.

initializer_orthogonal

Initializer that generates a random orthogonal matrix.

Returns the index of the minimum value along an axis.

Active Keras backend

k_cast_to_floatx

Cast an array to the default Keras float type.

application_mobilenet_v2

MobileNetV2 model architecture

k_categorical_crossentropy

Categorical crossentropy between an output tensor and a target tensor.

application_vgg

VGG16 and VGG19 models for Keras.

1D convolution.

2D convolution.

application_xception

Xception V1 model for Keras.

Clone a model instance.

compile.keras.engine.training.Model

Configure a Keras model for training

dataset_boston_housing

Boston housing price regression dataset

Cumulative product of the values in a tensor, alongside the specified axis.

Cumulative sum of the values in a tensor, alongside the specified axis.

Element-wise exponential.

Adds a 1-sized dimension at index axis.

dataset_cifar10

CIFAR10 small image classification

activation_relu

Activation functions

application_densenet

Instantiates the DenseNet architecture.

Keras backend tensor engine

Get the uid for the default graph.

Returns the value of a variable.

application_inception_resnet_v2

Inception-ResNet v2 model, with weights trained on ImageNet

Bidirectional wrapper for RNNs.

callback_model_checkpoint

Save the model after every epoch.

application_inception_v3

Inception V3 model, with weights pre-trained on ImageNet.

fit.keras.engine.training.Model

Train a Keras model

Fits the model on data yielded batch-by-batch by a generator.

application_resnet50

ResNet50 model for Keras.

application_nasnet

Instantiates a NASNet model.

callback_reduce_lr_on_plateau

Reduce learning rate when a metric has stopped improving.

callback_remote_monitor

Callback used to stream events to a server.

Returns the shape of tensor or variable as a list of int or NULL entries.

k_is_keras_tensor

Returns whether x is a Keras tensor.

callback_progbar_logger

Callback that prints metrics to stdout.

IMDB Movie reviews sentiment classification

Base R6 class for Keras layers

Computes log(sum(exp(elements across dimensions of a tensor))).

Create a Keras Layer

fit_image_data_generator

Fit image data generator internal statistics to some sample data.

Create a Keras Wrapper

Base R6 class for Keras wrappers

fit_text_tokenizer

Update tokenizer internal vocabulary based on a list of texts or list of sequences.

callback_csv_logger

Callback that streams epoch results to a csv file

k_manual_variable_initialization

Sets the manual variable initialization flag.

callback_early_stopping

Stop training when a monitored quantity has stopped improving.

Layer/Model weights as R arrays

Layer/Model configuration

Representation of HDF5 dataset to be used instead of an R array

initializer_glorot_normal

Glorot normal initializer, also called Xavier normal initializer.

initializer_constant

Initializer that generates tensors initialized to a constant value.

callback_tensorboard

TensorBoard basic visualizations

MNIST database of handwritten digits

Downloads a file from a URL if it not already in the cache.

initializer_he_uniform

He uniform variance scaling initializer.

initializer_truncated_normal

Initializer that generates a truncated normal distribution.

initializer_identity

Initializer that generates the identity matrix.

flow_images_from_data

Generates batches of augmented/normalized data from image data and labels

Loads an image into PIL format.

image_data_generator

Generate batches of image data with real-time data augmentation. The data will be looped over (in batches).

flow_images_from_directory

Generates batches of data from images in a directory (with optional augmented/normalized data)

callback_terminate_on_naan

Callback that terminates training when a NaN loss is encountered.

imagenet_preprocess_input

Preprocesses a tensor or array encoding a batch of images.

Keras implementation

Minimum value in a tensor.

is_keras_available

Check if Keras is Available

initializer_random_normal

Initializer that generates tensors with a normal distribution.

Element-wise absolute value.

initializer_random_uniform

Initializer that generates tensors with a uniform distribution.

Creates a 1D tensor containing a sequence of integers.

dataset_cifar100

CIFAR100 small image classification

initializer_variance_scaling

Initializer capable of adapting its scale to the shape of weights.

Bitwise reduction (logical AND).

k_batch_get_value

Returns the value of more than one tensor variable.

Returns the index of the maximum value along an axis.

dataset_fashion_mnist

Fashion-MNIST database of fashion articles

k_binary_crossentropy

Binary crossentropy between an output tensor and a target tensor.

k_batch_set_value

Sets the values of many tensor variables at once.

k_batch_normalization

Applies batch normalization on x given mean, var, beta and gamma.

Bitwise reduction (logical OR).

Element-wise minimum of two tensors.

Reverse a tensor along the specified axes.

Casts a tensor to a different dtype and returns it.

evaluate_generator

Evaluates the model on a data generator.

k_conv3d_transpose

3D deconvolution (i.e. transposed convolution).

k_random_binomial

Returns a tensor with random binomial distribution of values.

Computes cos of x element-wise.

k_clear_session

Destroys the current TF graph and creates a new one.

Returns the static number of elements in a Keras variable or tensor.

Element-wise value clipping.

Adds a bias vector to a tensor.

k_ctc_batch_cost

Runs CTC loss algorithm on each batch element.

export_savedmodel.keras.engine.training.Model

Export a Saved Model

k_depthwise_conv2d

Depthwise 2D convolution with separable filters.

3D array representation of images

Element-wise sign.

Decodes the output of a softmax.

k_random_normal

Returns a tensor with normal distribution of values.

Exponential linear unit.

Reduce elems using fn to combine them from right to left.

Fuzz factor used in numeric expressions.

Instantiates a Keras function

imagenet_decode_predictions

Decodes the prediction of an ImageNet model.

Creates a tensor by tiling x by n.

initializer_lecun_uniform

LeCun uniform initializer.

initializer_zeros

Initializer that generates tensors initialized to 0.

initializer_lecun_normal

LeCun normal initializer.

Multiplies 2 tensors (and/or variables) and returns a tensor.

Element-wise equality between two tensors.

k_ctc_label_dense_to_sparse

Converts CTC labels from dense to sparse.

Install Keras and the TensorFlow backend

Batchwise dot product.

Iterates over the time dimension of a tensor

k_batch_flatten

Turn a nD tensor into a 2D tensor with same 1st dimension.

Retrieves the elements of indices indices in the tensor reference.

Evaluates the value of a variable.

Instantiate an identity matrix and returns it.

Concatenates a list of tensors alongside the specified axis.

Flatten a tensor.

k_image_data_format

Default image data format convention ('channels_first' or 'channels_last').

TF session to be used by the backend.

k_in_test_phase

Selects x in test phase, and alt otherwise.

Creates a constant tensor.

Segment-wise linear approximation of sigmoid.

Returns the gradients of variables w.r.t. loss.

k_get_variable_shape

Returns the shape of a variable.

k_learning_phase

Returns the learning phase flag.

layer_activation_elu

Exponential Linear Unit.

k_conv2d_transpose

2D deconvolution (i.e. transposed convolution).

Returns a tensor with the same content as the input tensor.

3D convolution.

Returns whether x is a symbolic tensor.

layer_max_pooling_2d

Max pooling operation for spatial data.

Computes sin of x element-wise.

k_moving_average_update

Compute the moving average of a variable.

Element-wise truth value of (x < y).

Removes a 1-dimension from the tensor at index axis.

Sets entries in x to zero at random, while scaling the entire tensor.

Stacks a list of rank R tensors into a rank R+1 tensor.

keras_model_custom

Create a Keras custom model

Element-wise truth value of (x <= y).

Converts a sparse tensor into a dense tensor and returns it.

Normalizes a tensor wrt the L2 norm alongside the specified axis.

keras_model_sequential

Keras Model composed of a linear stack of layers

Returns the dtype of a Keras tensor or variable, as a string.

layer_activation

Apply an activation function to an output.

2D convolution layer (e.g. spatial convolution over images).

Default float type

Element-wise maximum of two tensors.

k_in_train_phase

Selects x in train phase, and alt otherwise.

Returns whether the targets are in the top k predictions.

Apply 2D conv with un-shared weights.

Mean of a tensor, alongside the specified axis.

Reduce elems using fn to combine them from left to right.

Apply 1D conv with un-shared weights.

Computes the one-hot representation of an integer tensor.

Instantiates an all-ones tensor variable and returns it.

Element-wise truth value of (x > y).

k_greater_equal

Element-wise truth value of (x >= y).

layer_average_pooling_2d

Average pooling operation for spatial data.

layer_activation_leaky_relu

Leaky version of a Rectified Linear Unit.

Element-wise log.

k_is_placeholder

Returns whether x is a placeholder.

layer_global_average_pooling_3d

Global Average pooling operation for 3D data.

Instantiates a placeholder tensor and returns it.

k_random_uniform_variable

Instantiates a variable with values drawn from a uniform distribution.

k_normalize_batch_in_training

Computes mean and std for batch then apply batch_normalization on batch.

Returns whether a tensor is a sparse tensor.

k_random_normal_variable

Instantiates a variable with values drawn from a normal distribution.

Returns the number of axes in a tensor, as an integer.

layer_average_pooling_1d

Average pooling for temporal data.

layer_depthwise_conv_2d

Depthwise separable 2D convolution.

Reset graph identifiers.

k_random_uniform

Returns a tensor with uniform distribution of values.

Add a densely-connected NN layer to an output

Element-wise inequality between two tensors.

layer_embedding

Turns positive integers (indexes) into dense vectors of fixed size.

Softplus of a tensor.

Prints message and the tensor value when evaluated.

Layer that subtracts two inputs.

Wraps arbitrary expression as a layer

Element-wise square.

Reshapes a tensor to the specified shape.

Map the function fn over the elements elems and return the outputs.

Standard deviation of a tensor, alongside the specified axis.

Element-wise rounding to the closest integer.

Multiplies the values in a tensor, alongside the specified axis.

k_resize_images

Resizes the images contained in a 4D tensor.

k_repeat_elements

Repeats the elements of a tensor along an axis.

Maximum value in a tensor.

Masks a sequence by using a mask value to skip timesteps.

Rectified linear unit.

layer_activation_selu

Scaled Exponential Linear Unit.

layer_global_max_pooling_1d

Global max pooling operation for temporal data.

Instantiates an all-zeros variable and returns it.

Instantiates an all-ones variable of the same shape as another tensor.

Returns the symbolic shape of a tensor or variable.

k_separable_conv2d

2D convolution with separable filters.

Sum of the values in a tensor, alongside the specified axis.

layer_locally_connected_1d

Locally-connected layer for 1D inputs.

k_permute_dimensions

Permutes axes in a tensor.

layer_max_pooling_3d

Max pooling operation for 3D data (spatial or spatio-temporal).

k_stop_gradient

Returns variables but with zero gradient w.r.t. every other variable.

Element-wise sigmoid.

metric_binary_accuracy

Model performance metrics

k_resize_volumes

Resizes the volume contained in a 5D tensor.

Update the value of x by subtracting decrement.

Softmax of a tensor.

layer_activation_thresholded_relu

Thresholded Rectified Linear Unit.

Update the value of x by adding increment.

Element-wise square root.

k_spatial_2d_padding

Pads the 2nd and 3rd dimensions of a 4D tensor.

k_spatial_3d_padding

Pads 5D tensor with zeros along the depth, height, width dimensions.

layer_global_average_pooling_2d

Global average pooling operation for spatial data.

Keras array object

Softsign of a tensor.

Update the value of x to new_x.

Element-wise tanh.

layer_upsampling_1d

Upsampling layer for 1D inputs.

k_temporal_padding

Pads the middle dimension of a 3D tensor.

R interface to Keras

Instantiates an all-zeros variable of the same shape as another tensor.

optimizer_adagrad

Adagrad optimizer.

Switches between two operations depending on a scalar value.

k_set_learning_phase

Sets the learning phase to a fixed value.

layer_activation_softmax

Softmax activation function.

Element-wise exponentiation.

layer_conv_2d_transpose

Transposed 2D convolution layer (sometimes called Deconvolution).

layer_upsampling_2d

Upsampling layer for 2D inputs.

layer_cudnn_gru

Fast GRU implementation backed by CuDNN.

3D convolution layer (e.g. spatial convolution over volumes).

layer_repeat_vector

Repeats the input n times.

layer_gaussian_dropout

Apply multiplicative 1-centered Gaussian noise.

layer_separable_conv_1d

Depthwise separable 1D convolution.

Variance of a tensor, alongside the specified axis.

layer_cropping_2d

Cropping layer for 2D input (e.g. picture).

Layer that adds a list of inputs.

layer_activation_parametric_relu

Parametric Rectified Linear Unit.

Repeats a 2D tensor.

layer_activation_relu

Rectified Linear Unit activation function

make_sampling_table

Generates a word rank-based probabilistic sampling table.

predict_on_batch

Returns predictions for a single batch of samples.

layer_cudnn_lstm

Fast LSTM implementation backed by CuDNN.

1D convolution layer (e.g. temporal convolution).

k_sparse_categorical_crossentropy

Categorical crossentropy with integer targets.

layer_global_max_pooling_2d

Global max pooling operation for spatial data.

layer_concatenate

Layer that concatenates a list of inputs.

layer_activity_regularization

Layer that applies an update to the cost function based input activity.

Sets the value of a variable, from an R array.

Transposes a tensor and returns it.

Instantiates a variable and returns it.

layer_alpha_dropout

Applies Alpha Dropout to the input.

Permute the dimensions of an input according to a given pattern

Gated Recurrent Unit - Cho et al.

Layer that computes the maximum (element-wise) a list of inputs.

layer_global_max_pooling_3d

Global Max pooling operation for 3D data.

layer_conv_3d_transpose

Transposed 3D convolution layer (sometimes called Deconvolution).

sequences_to_matrix

Convert a list of sequences into a matrix.

optimizer_rmsprop

RMSProp optimizer

Layer that averages a list of inputs.

layer_gaussian_noise

Apply additive zero-centered Gaussian noise.

k_truncated_normal

Returns a tensor with truncated random normal distribution of values.

layer_average_pooling_3d

Average pooling operation for 3D data (spatial or spatio-temporal).

texts_to_sequences_generator

Transforms each text in texts in a sequence of integers.

Generates probability or class probability predictions for the input samples.

layer_locally_connected_2d

Locally-connected layer for 2D inputs.

layer_conv_lstm_2d

Convolutional LSTM.

layer_max_pooling_1d

Max pooling operation for temporal data.

layer_cropping_3d

Cropping layer for 3D data (e.g. spatial or spatio-temporal).

layer_zero_padding_1d

Zero-padding layer for 1D input (e.g. temporal sequence).

Flattens an input

layer_separable_conv_2d

Separable 2D convolution.

Layer that multiplies (element-wise) a list of inputs.

layer_global_average_pooling_1d

Global average pooling operation for temporal data.

layer_batch_normalization

Batch normalization layer (Ioffe and Szegedy, 2014).

serialize_model

Serialize a model to an R object

time_distributed

Apply a layer to every temporal slice of an input.

Layer that computes a dot product between samples in two tensors.

Reshapes an output to a certain shape.

Model configuration as JSON

layer_zero_padding_3d

Zero-padding layer for 3D data (spatial or spatio-temporal).

layer_spatial_dropout_2d

Spatial 2D version of Dropout.

layer_cropping_1d

Cropping layer for 1D input (e.g. temporal sequence).

Single gradient update or model evaluation over one batch of samples.

Layer that computes the minimum (element-wise) a list of inputs.

Applies Dropout to the input.

layer_upsampling_3d

Upsampling layer for 3D inputs.

Long Short-Term Memory unit - Hochreiter 1997.

layer_simple_rnn

Fully-connected RNN where the output is to be fed back to input.

save_model_hdf5

Save/Load models using HDF5 files

layer_spatial_dropout_3d

Spatial 3D version of Dropout.

Normalize a matrix or nd-array

texts_to_matrix

Convert a list of texts to a matrix.

layer_spatial_dropout_1d

Spatial 1D version of Dropout.

Stochastic gradient descent optimizer

Model configuration as YAML

save_model_weights_hdf5

Save/Load model weights using HDF5 files

layer_zero_padding_2d

Zero-padding layer for 2D input (e.g. picture).

optimizer_adadelta

Adadelta optimizer.

Assign values to names

Reset the states for a layer

Generates skipgram word pairs.

text_to_word_sequence

Convert text to a sequence of words (or tokens).

plot.keras_training_history

Plot training history

text_hashing_trick

Converts a text to a sequence of indexes in a fixed-size hashing space.

predict_generator

Generates predictions for the input samples from a data generator.

optimizer_adamax

Adamax optimizer

timeseries_generator

Utility function for generating batches of temporal data.

loss_mean_squared_error

Model loss functions

save_text_tokenizer

Save a text tokenizer to an external file

Text tokenization utility

predict.keras.engine.training.Model

Generate predictions from a Keras model

multi_gpu_model

Replicates a model on different GPUs.

optimizer_nadam

Nesterov Adam optimizer

Remove the last layer in a model

Objects exported from other packages

Pads sequences to the same length

with_custom_object_scope

Provide a scope with mappings of names to custom objects

L1 and L2 regularization

texts_to_sequences

Transform each text in texts in a sequence of integers.

use_implementation

Select a Keras implementation and backend

summary.keras.engine.training.Model

Print a summary of a Keras model

One-hot encode a text into a list of word indexes in a vocabulary of size n.

Converts a class vector (integers) to binary class matrix.

KerasConstraint

Base R6 class for Keras constraints

callback_lambda

Create a custom callback