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Returns |
String, the current default float type. |
Example |
>>> tf.keras.backend.floatx() |
'float32' |
set_floatx function |
tf.keras.backend.set_floatx(value) |
Sets the default float type. |
Note: It is not recommended to set this to float16 for training, as this will likely cause numeric stability issues. Instead, mixed precision, which is using a mix of float16 and float32, can be used by calling tf.keras.mixed_precision.experimental.set_policy('mixed_float16'). See the mixed precision guide for details. |
Arguments |
value: String; 'float16', 'float32', or 'float64'. |
Example |
>>> tf.keras.backend.floatx() |
'float32' |
>>> tf.keras.backend.set_floatx('float64') |
>>> tf.keras.backend.floatx() |
'float64' |
>>> tf.keras.backend.set_floatx('float32') |
Raises |
ValueError: In case of invalid value. |
image_data_format function |
tf.keras.backend.image_data_format() |
Returns the default image data format convention. |
Returns |
A string, either 'channels_first' or 'channels_last' |
Example |
>>> tf.keras.backend.image_data_format() |
'channels_last' |
set_image_data_format function |
tf.keras.backend.set_image_data_format(data_format) |
Sets the value of the image data format convention. |
Arguments |
data_format: string. 'channels_first' or 'channels_last'. |
Example |
>>> tf.keras.backend.image_data_format() |
'channels_last' |
>>> tf.keras.backend.set_image_data_format('channels_first') |
>>> tf.keras.backend.image_data_format() |
'channels_first' |
>>> tf.keras.backend.set_image_data_format('channels_last') |
Raises |
ValueError: In case of invalid data_format value. |
epsilon function |
tf.keras.backend.epsilon() |
Returns the value of the fuzz factor used in numeric expressions. |
Returns |
A float. |
Example |
>>> tf.keras.backend.epsilon() |
1e-07 |
set_epsilon function |
tf.keras.backend.set_epsilon(value) |
Sets the value of the fuzz factor used in numeric expressions. |
Arguments |
value: float. New value of epsilon. |
Example |
>>> tf.keras.backend.epsilon() |
1e-07 |
>>> tf.keras.backend.set_epsilon(1e-5) |
>>> tf.keras.backend.epsilon() |
1e-05 |
>>> tf.keras.backend.set_epsilon(1e-7) |
is_keras_tensor function |
tf.keras.backend.is_keras_tensor(x) |
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