tf.raw_ops.SparseApplyFtrl

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

tf.raw_ops.SparseApplyFtrl(
    var,
    accum,
    linear,
    grad,
    indices,
    lr,
    l1,
    l2,
    lr_power,
    use_locking=False,
    multiply_linear_by_lr=False,
    name=None
)

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

\[accum_new = accum + grad * grad\]

\[linear += grad + (accum_{new}^{-lr_{power} } - accum^{-lr_{power} } / lr * var\]

\[quadratic = 1.0 / (accum_{new}^{lr_{power} } * lr) + 2 * l2\]

\[var = (sign(linear) * l1 - linear) / quadratic\ if\ |linear| > l1\ else\ 0.0\]

\[accum = accum_{new}\]

var A mutable Tensor. Must be one of the following types: float32, float64, int32, uint8, int16, int8, complex64, int64, qint8, quint8, qint32, bfloat16, qint16, quint16, uint16, complex128, half, uint32, uint64. Should be from a Variable().
accum A mutable Tensor. Must have the same type as var. Should be from a Variable().
linear A mutable Tensor. Must have the same type as var. Should be from a Variable().
grad A Tensor. Must have the same type as var. The gradient.
indices A Tensor. Must be one of the following types: int32, int64. A vector of indices into the first dimension of var and accum.
lr A Tensor. Must have the same type as var. Scaling factor. Must be a scalar.
l1 A Tensor. Must have the same type as var. L1 regularization. Must be a scalar.
l2 A Tensor. Must have the same type as var. L2 regularization. Must be a scalar.
lr_power A Tensor. Must have the same type as var. Scaling factor. Must be a scalar.
use_locking An optional bool. Defaults to False. 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.
multiply_linear_by_lr An optional bool. Defaults to False.
name A name for the operation (optional).

A mutable Tensor. Has the same type as var.