Python tensorflow.math.ceil()用法及代码示例

TensorFlow是Google设计的开源Python库，用于开发机器学习模型和深度学习神经网络。 ceil()用于查找输入的元素明智的ceil值。

用法：tensorflow.math.ceil( x, name)

范例1：

# importing the library 
import tensorflow as tf 
  
# initializing the input 
a = tf.constant([1.5, 2.7, 3.9, 1.2, 1.8], dtype = tf.float64) 
  
# printing the input  
print('a:',a) 
  
# Finding the ceil value 
r = tf.math.ceil(a) 
  
# printing the result 
print("Result:",r)

输出：

a: tf.Tensor([1.5 2.7 3.9 1.2 1.8], shape=(5,), dtype=float64)
Result: tf.Tensor([2. 3. 4. 2. 2.], shape=(5,), dtype=float64)

范例2：在该示例中，使用了二维张量。

# importing the library 
import tensorflow as tf 
  
# initializing the input 
a = tf.constant([[1.5, 2.7], [3.9, 1.2]], dtype = tf.float64) 
  
# printing the input  
print('a:',a) 
  
# Finding the ceil value 
r = tf.math.ceil(a) 
  
# printng the result 
print('Result:',r)

输出：

a: tf.Tensor(
[[1.5 2.7]
 [3.9 1.2]], shape=(2, 2), dtype=float64)
Result: tf.Tensor(
[[2. 3.]
 [4. 2.]], shape=(2, 2), dtype=float64)

范例3：在此示例中，使用了无效的dtype张量。它将引发NotFoundError。

# importing the library 
import tensorflow as tf 
  
# initializing the input 
a = tf.constant([1.5, 2.7, 3.9, 1.2, 1.8], dtype = tf.complex128) 
  
# printing the input  
print('a:',a) 
  
# Finding the ceil value 
r = tf.math.ceil(a)

输出：

a: tf.Tensor([1.5+0.j 2.7+0.j 3.9+0.j 1.2+0.j 1.8+0.j], shape=(5,), dtype=complex128)

---------------------------------------------------------------------------

NotFoundError                             Traceback (most recent call last)

<ipython-input-49-e349e3adf9c3> in <module>()
      6 
      7 # Finding the ceil value
----> 8 r = tf.math.ceil(a)

4 frames

/usr/local/lib/python3.6/dist-packages/six.py in raise_from(value, from_value)

NotFoundError:Could not find valid device for node.
Node:{{node Ceil}}
All kernels registered for op Ceil:
  device='XLA_GPU'; T in [DT_FLOAT, DT_DOUBLE, DT_BFLOAT16, DT_HALF]
  device='XLA_CPU'; T in [DT_FLOAT, DT_DOUBLE, DT_BFLOAT16, DT_HALF]
  device='XLA_CPU_JIT'; T in [DT_FLOAT, DT_DOUBLE, DT_BFLOAT16, DT_HALF]
  device='XLA_GPU_JIT'; T in [DT_FLOAT, DT_DOUBLE, DT_BFLOAT16, DT_HALF]
  device='GPU'; T in [DT_DOUBLE]
  device='GPU'; T in [DT_HALF]
  device='GPU'; T in [DT_FLOAT]
  device='CPU'; T in [DT_DOUBLE]
  device='CPU'; T in [DT_HALF]
  device='CPU'; T in [DT_FLOAT]
 [Op:Ceil]