class deepobs.tensorflow.datasets.quadratic.quadratic(batch_size, dim=100, train_size=1000, noise_level=0.6)[source]

DeepOBS data set class to create an n dimensional stochastic quadratic testproblem.

This toy data set consists of a fixed number (train_size) of iid draws from a zero-mean normal distribution in dim dimensions with isotropic covariance specified by noise_level.
Parameters: batch_size (int) -- The mini-batch size to use. Note that, if batch_size is not a divider of the dataset size (1000 for train and test) the remainder is dropped in each epoch (after shuffling). dim (int) -- Dimensionality of the quadratic. Defaults to 100. train_size (int) -- Size of the dataset; will be used for train, train eval and test datasets. Defaults to 1000. noise_level (float) -- Standard deviation of the data points around the mean. The data points are drawn from a Gaussian distribution. Defaults to 0.6.
batch

A tensor X of shape (batch_size, dim) yielding elements from the dataset. Executing these tensors raises a tf.errors.OutOfRangeError after one epoch.

train_init_op

A tensorflow operation initializing the dataset for the training phase.

train_eval_init_op

A tensorflow operation initializing the testproblem for evaluating on training data.

test_init_op

A tensorflow operation initializing the testproblem for evaluating on test data.

phase

A string-value tf.Variable that is set to train, train_eval or test, depending on the current phase. This can be used by testproblems to adapt their behavior to this phase.