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paddle.jit / ProgramTranslator
ProgramTranslator¶
将动态图函数转为静态图函数的类。该类是个单例(singleton)。
- 参数:
-
无。
返回:ProgramTranslator 单例对象。
示例代码
import paddle
# 以下两种调用方法得到同一个对象,因为ProgramTranslator是个单例
paddle.jit.ProgramTranslator()
paddle.jit.ProgramTranslator.get_instance()
-
enable
( enable_static ) ¶
全局开启或关闭动态图转化为静态图。
- 参数:
-
enable_static (bool) - 设置True或者False来打开或关闭动静转化 。
返回:None。
示例代码
import paddle
@paddle.jit.to_static
def func(x):
if paddle.mean(x) > 0:
x_v = x - 1
else:
x_v = x + 1
return x_v
prog_trans = paddle.jit.ProgramTranslator()
prog_trans.enable(False)
x = paddle.ones([1, 2])
# ProgramTranslator被关闭所以func会以动态图模式运行
print(func(x)) # [[0. 0.]]
-
get_output
( dygraph_func, *args, **kwargs ) ¶
返回动态图函数输出的Tensor,但是该动态图函数的数值计算过程会被转化为静态图模式运行。
- 参数:
-
dygraph_func (callable) - 动态图函数。
args, kwargs - 动态图函数的输入。
返回:包含数值结果的Tensor或者Tensor的元组,是输入动态图函数的返回值。
示例代码
import paddle
def func(x):
if paddle.mean(x) > 0:
x_v = x - 1
else:
x_v = x + 1
return x_v
prog_trans = paddle.jit.ProgramTranslator()
x = paddle.ones([1, 2])
x_v = prog_trans.get_output(func, x)
print(x_v) # [[0. 0.]]
-
get_func
( dygraph_func ) ¶
返回一个可调用函数,该函数将输入动态图函数接口转化为静态图组网接口。组网接口不像动态图接口,其并不直接返回数据结果。用户需要自行处理对应的Program和Eexecutor。
- 参数:
-
dygraph_func (callable) - 动态图函数。
返回:将动态图接口转为静态图组网接口的可调用函数。
示例代码
import paddle
def func(x):
if paddle.mean(x) > 0:
x_v = x - 1
else:
x_v = x + 1
return x_v
prog_trans = paddle.jit.ProgramTranslator()
static_func = prog_trans.get_func(func)
print(callable(static_func)) # True
-
get_program
( dygraph_func, *args, **kwargs ) ¶
返回动态图函数转化后的静态图Program和输入输出Varaible。用户可以使用Executor来执行该Program。
- 参数:
-
dygraph_func (callable) - 动态图函数。
args, kwargs - 动态图函数的输入。
- 返回:元组(main_program, startup_program, inputs, outputs)
-
main_program: 转化后的main program。 startup_program: 转化后的startup program。 inputs: 输入Tensor的列表,这些Tensor可以在执行去feed。 outputs: 输出Tensor的列表,这些Tensor可以在运行时被fetch。
示例代码
import paddle
def func(x):
if paddle.mean(x) > 0:
x_v = x - 1
else:
x_v = x + 1
return x_v
prog_trans = paddle.jit.ProgramTranslator()
x = paddle.ones([1, 2])
main_prog, start_prog, inputs, outputs = prog_trans.get_program(func, x)
print([i.name for i in inputs])
# [u'generated_tensor_0'] 需要被feed的输入Tensor名字,对应x
print([o.name for o in outputs])
# [u'_generated_var_4'] 需要被fetch的输出Tensor名字,对应x_v
-
get_code
( dygraph_func ) ¶
返回动态图函数转化后的静态图代码字符串。
- 参数:
-
dygraph_func (callable) - 动态图函数。
返回:转化后的静态图代码字符串。
示例代码
import paddle
def func(x):
if paddle.mean(x) > 0:
x_v = x - 1
else:
x_v = x + 1
return x_v
prog_trans = paddle.jit.ProgramTranslator()
code = prog_trans.get_code(func)
print(type(code)) # <class 'str'>
-
get_program_cache
( ) ¶
返回ProgramCache单例。这个方法是PaddlePaddle开发者用来管理ProgramTranslator中的Program缓存,普通用户不需要使用这个方法。
返回:ProgramTranslator中的ProgramCache。
示例代码
import paddle
prog_trans = paddle.jit.ProgramTranslator()
prog_cache = prog_trans.get_program_cache()
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