<commit_before># Copyright 2015 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
"""One-line documentation for rmsprop module.

rmsprop algorithm [tieleman2012rmsprop]

A detailed description of rmsprop.

- maintain a moving (discounted) average of the square of gradients
- divide gradient by the root of this average

mean_square = decay * mean_square{t-1} + (1-decay) * gradient ** 2
mom = momentum * mom{t-1} + learning_rate * g_t / sqrt(mean_square + epsilon)
delta = - mom

This implementation of RMSProp uses plain momentum, not Nesterov momentum.

The centered version additionally maintains a moving (discounted) average of the
gradients, and uses that average to estimate the variance:

mean_grad = decay * mean_square{t-1} + (1-decay) * gradient
mean_square = decay * mean_square{t-1} + (1-decay) * gradient ** 2
mom = momentum * mom{t-1} + learning_rate * g_t /
    sqrt(mean_square - mean_grad**2 + epsilon)
delta = - mom
"""

from __future__ import absolute_import<commit_msg>Correct the formulation in the description of the centered rmsprop<commit_after># Copyright 2015 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
"""One-line documentation for rmsprop module.

rmsprop algorithm [tieleman2012rmsprop]

A detailed description of rmsprop.

- maintain a moving (discounted) average of the square of gradients
- divide gradient by the root of this average

mean_square = decay * mean_square{t-1} + (1-decay) * gradient ** 2
mom = momentum * mom{t-1} + learning_rate * g_t / sqrt(mean_square + epsilon)
delta = - mom

This implementation of RMSProp uses plain momentum, not Nesterov momentum.

The centered version additionally maintains a moving (discounted) average of the
gradients, and uses that average to estimate the variance:

mean_grad = decay * mean_grad{t-1} + (1-decay) * gradient
mean_square = decay * mean_square{t-1} + (1-decay) * gradient ** 2
mom = momentum * mom{t-1} + learning_rate * g_t /
    sqrt(mean_square - mean_grad**2 + epsilon)
delta = - mom
"""

from __future__ import absolute_import
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