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# tensorflow::ops::SparseApplyFtrl

#include <training_ops.h>

Update relevant entries in '*var' according to the Ftrl-proximal scheme.

## Summary

That is for rows we have grad for, we update var, accum and linear as follows:

$$accum_new = accum + grad * grad$$
$$linear += grad + (accum_{new}^{-lr_{power} } - accum^{-lr_{power} } / lr * var$$
$$quadratic = 1.0 / (accum_{new}^{lr_{power} } * lr) + 2 * l2$$
$$var = (sign(linear) * l1 - linear) / quadratic\ if\ |linear| > l1\ else\ 0.0$$
$$accum = accum_{new}$$

Arguments:

• scope: A Scope object
• var: Should be from a Variable().
• accum: Should be from a Variable().
• linear: Should be from a Variable().
• indices: A vector of indices into the first dimension of var and accum.
• lr: Scaling factor. Must be a scalar.
• l1: L1 regularization. Must be a scalar.
• l2: L2 regularization. Must be a scalar.
• lr_power: Scaling factor. Must be a scalar.

Optional attributes (see Attrs):

• use_locking: If True, updating of the var and accum tensors will be protected by a lock; otherwise the behavior is undefined, but may exhibit less contention.

Returns:

• Output: Same as "var".

### Constructors and Destructors

SparseApplyFtrl(const ::tensorflow::Scope & scope, ::tensorflow::Input var, ::tensorflow::Input accum, ::tensorflow::Input linear, ::tensorflow::Input grad, ::tensorflow::Input indices, ::tensorflow::Input lr, ::tensorflow::Input l1, ::tensorflow::Input l2, ::tensorflow::Input lr_power)
SparseApplyFtrl(const ::tensorflow::Scope & scope, ::tensorflow::Input var, ::tensorflow::Input accum, ::tensorflow::Input linear, ::tensorflow::Input grad, ::tensorflow::Input indices, ::tensorflow::Input lr, ::tensorflow::Input l1, ::tensorflow::Input l2, ::tensorflow::Input lr_power, const SparseApplyFtrl::Attrs & attrs)

### Public attributes

operation
Operation
out
::tensorflow::Output

### Public functions

node() const
::tensorflow::Node *
operator::tensorflow::Input() const
 
 
operator::tensorflow::Output() const
 
 

### Public static functions

MultiplyLinearByLr(bool x)
Attrs
UseLocking(bool x)
Attrs

### Structs

tensorflow::ops::SparseApplyFtrl::Attrs

Optional attribute setters for SparseApplyFtrl.

## Public attributes

### operation

Operation operation

### out

::tensorflow::Output out

## Public functions

### SparseApplyFtrl

 SparseApplyFtrl(
const ::tensorflow::Scope & scope,
::tensorflow::Input var,
::tensorflow::Input accum,
::tensorflow::Input linear,
::tensorflow::Input indices,
::tensorflow::Input lr,
::tensorflow::Input l1,
::tensorflow::Input l2,
::tensorflow::Input lr_power
)

### SparseApplyFtrl

 SparseApplyFtrl(
const ::tensorflow::Scope & scope,
::tensorflow::Input var,
::tensorflow::Input accum,
::tensorflow::Input linear,
::tensorflow::Input indices,
::tensorflow::Input lr,
::tensorflow::Input l1,
::tensorflow::Input l2,
::tensorflow::Input lr_power,
const SparseApplyFtrl::Attrs & attrs
)

### node

::tensorflow::Node * node() const

### operator::tensorflow::Input

 operator::tensorflow::Input() const

### operator::tensorflow::Output

 operator::tensorflow::Output() const

## Public static functions

### MultiplyLinearByLr

Attrs MultiplyLinearByLr(
bool x
)

### UseLocking

Attrs UseLocking(
bool x
)