library(tfautograph)
tf_pow <- tf_function(function(x, pow) {
tf_switch(pow,
0 ~ 1,
1 ~ x,
2 ~ x * x,
3 ~ x * x * x,
default = ~ -1)
})
# can optionally also omit the left hand side int, in which case the order of
# the functions is used.
tf_pow <- function(x, pow) {
tf_switch(pow,
~ 1,
~ x,
~ x * x,
~ x * x * x,
default = ~ -1)
}
# supply just some of the ints to override the default order
tf_pow <- function(x, pow) {
tf_switch(pow,
3 ~ x * x * x,
2 ~ x * x,
~ 1,
~ x,
default = ~ -1)
}
# A slightly less contrived example:
tf_norm <- tf_function(function(x, l) {
tf_switch(l,
0 ~ tf$reduce_sum(tf$cast(x != 0, tf$float32)), # L0 norm
1 ~ tf$reduce_sum(tf$abs(x)), # L1 norm
2 ~ tf$sqrt(tf$reduce_sum(tf$square(x))), # L2 norm
default = ~ tf$reduce_max(tf$abs(x))) # L-infinity norm
}) tf_switch
tf.switch_case
Description
tf.switch_case
Usage
tf_switch(
branch_index,
...,
branch_fns = list(...),
default = NULL,
name = "switch_case"
) Arguments
| Arguments | Description |
|---|---|
| branch_index | an integer tensor |
| …, branch_fns | a list of function bodies specified with a ~, optionally supplied with a branch index on the left hand side. See examples |
| default | A function defined with a ~, or something coercible via as.function()`` | | name | a string, passed on totf.switch_case()` |
Value
The result from tf.switch_case()