tfm.vision.layers.BottleneckBlock

A standard bottleneck block.

filters An int number of filters for the first two convolutions. Note that the third and final convolution will use 4 times as many filters.
strides An int block stride. If greater than 1, this block will ultimately downsample the input.
dilation_rate An int dilation_rate of convolutions. Default to 1.
use_projection A bool for whether this block should use a projection shortcut (versus the default identity shortcut). This is usually True for the first block of a block group, which may change the number of filters and the resolution.
se_ratio A float or None. Ratio of the Squeeze-and-Excitation layer.
resnetd_shortcut A bool. If True, apply the resnetd style modification to the shortcut connection.
stochastic_depth_drop_rate A float or None. If not None, drop rate for the stochastic depth layer.
kernel_initializer A str of kernel_initializer for convolutional layers.
kernel_regularizer A tf.keras.regularizers.Regularizer object for Conv2D. Default to None.
bias_regularizer A tf.keras.regularizers.Regularizer object for Conv2d. Default to None.
activation A str name of the activation function.
use_sync_bn A bool. If True, use synchronized batch normalization.
norm_momentum A float of normalization momentum for the moving average.
norm_epsilon A float added to variance to avoid dividing by zero.
bn_trainable A bool that indicates whether batch norm layers should be trainable. Default to True.
**kwargs Additional keyword arguments to be passed.

Methods

call

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This is where the layer's logic lives.

The call() method may not create state (except in its first invocation, wrapping the creation of variables or other resources in tf.init_scope()). It is recommended to create state in __init__(), or the build() method that is called automatically before call() executes the first time.

Args
inputs Input tensor, or dict/list/tuple of input tensors. The first positional inputs argument is subject to special rules:

  • inputs must be explicitly passed. A layer cannot have zero arguments, and inputs cannot be provided via the default value of a keyword argument.
  • NumPy array or Python scalar values in inputs get cast as tensors.
  • Keras mask metadata is only collected from inputs.
  • Layers are built (build(input_shape) method) using shape info from inputs only.
  • input_spec compatibility is only checked against inputs.
  • Mixed precision input casting is only applied to inputs. If a layer has tensor arguments in *args or **kwargs, their casting behavior in mixed precision should be handled manually.
  • The SavedModel input specification is generated using inputs only.
  • Integration with various ecosystem packages like TFMOT, TFLite, TF.js, etc is only supported for inputs and not for tensors in positional and keyword arguments.
*args Additional positional arguments. May contain tensors, although this is not recommended, for the reasons above.
**kwargs Additional keyword arguments. May contain tensors, although this is not recommended, for the reasons above. The following optional keyword arguments are reserved:
  • training: Boolean scalar tensor of Python boolean indicating whether the call is meant for training or inference.
  • mask: Boolean input mask. If the layer's call() method takes a mask argument, its default value will be set to the mask generated for inputs by the previous layer (if input did come from a layer that generated a corresponding mask, i.e. if it came from a Keras layer with masking support).
  • Returns
    A tensor or list/tuple of tensors.