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modify some typos (#5198)
* Update principle_cn.md * Update principle_cn.md * Update principle_cn.md
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docs/guides/jit/principle_cn.md

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@@ -187,27 +187,29 @@ def add_two(x, y):
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如下代码样例中的 `if label is not None`, 此判断只依赖于 `label` 是否为 `None`(存在性),并不依赖 `label` 的 Tensor 值(数值性),因此属于**不依赖 Tensor 的控制流**
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```python
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from paddle.jit import to_static
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def not_depend_tensor_if(x, label=None):
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out = x + 1
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if label is not None: # <----- python bool 类型
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out = paddle.nn.functional.cross_entropy(out, label)
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return out
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print(to_static(not_depend_tensor_ifw).code)
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print(to_static(not_depend_tensor_if).code)
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# 转写后的代码:
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"""
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def not_depend_tensor_if(x, label=None):
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out = x + 1
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def true_fn_1(label, out): # true 分支
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def true_fn_0(label, out): # true 分支
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out = paddle.nn.functional.cross_entropy(out, label)
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return out
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def false_fn_1(out): # false 分支
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def false_fn_0(out): # false 分支
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return out
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out = paddle.jit.dy2static.convert_ifelse(label is not None, true_fn_1,
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false_fn_1, (label, out), (out,), (out,))
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out = paddle.jit.dy2static.convert_ifelse(label is not None, true_fn_0,
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false_fn_0, (label, out), (out,), (out,))
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return out
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"""
@@ -219,6 +221,8 @@ def not_depend_tensor_if(x, label=None):
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如下代码样例中的 `if paddle.mean(x) > 5`, 此判断直接依赖 `paddle.mean(x)` 返回的 Tensor 值(数值性),因此属于**依赖 Tensor 的控制流**
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```python
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from paddle.jit import to_static
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def depend_tensor_if(x):
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if paddle.mean(x) > 5.: # <---- Bool Tensor 类型
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out = x - 1
@@ -230,7 +234,7 @@ print(to_static(depend_tensor_if).code)
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# 转写后的代码:
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"""
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def depend_tensor_if(x):
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out = paddle.jit.dy2static.data_layer_not_check(name='out', shape=[-1],
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out = paddle.jit.dy2static.data_layer_not_check(name='out_0', shape=[-1],
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dtype='float32')
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def true_fn_0(x): # true 分支
@@ -280,6 +284,8 @@ def convert_ifelse(pred, true_fn, false_fn, true_args, false_args, return_vars):
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如下代码样例中的 `while a < 10`, 此循环条件中的 `a` 是一个 `int` 类型,并不是 Tensor 类型,因此属于**不依赖 Tensor 的控制流**
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```python
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from paddle.jit import to_static
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def not_depend_tensor_while(x):
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a = 1
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@@ -315,10 +321,12 @@ def not_depend_tensor_while(x):
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如下代码样例中的 `for i in range(bs)`, 此循环条件中的 `bs` 是一个 `paddle.shape` 返回的 Tensor 类型,且将其 Tensor 值作为了循环的终止条件,因此属于**依赖 Tensor 的控制流**
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```python
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from paddle.jit import to_static
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def depend_tensor_while(x):
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bs = paddle.shape(x)[0]
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for i in range(bs): # <---- bas is a Tensor
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for i in range(bs): # <---- bs is a Tensor
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x = x + 1
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return x

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