jax循环语句

import jax
import jax.numpy as jnp

### 1. jax.lax.while_loop
# jax.lax.while_loop(cond_fun, body_fun, init_val)
init_val = 0
cond_fun = lambda x: x<10
body_fun = lambda x: x+1
result = jax.lax.while_loop(cond_fun, body_fun, init_val)
print(result)

### 2. jax.lax.fori_loop
# jax.lax.fori_loop(lower, upper, body_fun, init_val, *, unroll=None)
init_val = 0
start = 0
stop = 10
body_fun = lambda i,x: x+i
result = jax.lax.fori_loop(start, stop, body_fun, init_val)
print(result)

### 3.jax.lax.scan
# jax.lax.scan(f, init, xs, length=None, reverse=False, unroll=1)
# 使用scan的时候，carry的变量也是需要显式地定义在函数中，并且是return的第一个变量

def f(carry, x):
    x = carry + x
    return x, x

xs = jnp.array([0, 1, 2, 3,])
result = jax.lax.scan(f, 0, xs)
print(result)

#haiku.scan(f, init, xs, length=None, reverse=False, unroll=1)[source]
#Equivalent to jax.lax.scan() but with Haiku state passed in/out.

参考：

https://jax.readthedocs.io/en/latest/_autosummary/jax.lax.while_loop.html

https://jax.readthedocs.io/en/latest/_autosummary/jax.lax.while_loop.html

https://jax.readthedocs.io/en/latest/_autosummary/jax.lax.scan.html#

https://dm-haiku.readthedocs.io/en/latest/api.html?highlight=haiku.scan#haiku.scan

原文地址：https://blog.csdn.net/qq_27390023/article/details/135712369

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