def test_uniquify_str(self):
r"""Tests :func:`texar.torch.utils.uniquify_str`.
"""
str_set = ['str']
unique_str = utils.uniquify_str('str', str_set)
self.assertEqual(unique_str, 'str_1')
str_set.append('str_1')
str_set.append('str_2')
unique_str = utils.uniquify_str('str', str_set)
self.assertEqual(unique_str, 'str_3')
def _build_layers(self,
layers: Optional[nn.ModuleList] = None,
layer_hparams: Optional[List[
Union[HParams, Dict[str, Any]]]] = None):
r"""Builds layers.
Either :attr:`layer_hparams` or :attr:`layers` must be
provided. If both are given, :attr:`layers` will be used.
Args:
layers (optional): A list of layer instances supplied as an instance
of :torch_nn:`ModuleList`.
layer_hparams (optional): A list of layer hparams, each to which
is fed to :func:`~texar.torch.core.layers.get_layer` to create
the layer instance.
"""
if layers is not None:
self._layers = layers
else:
if layer_hparams is None:
raise ValueError(
'Either `layer` or `layer_hparams` is required.')
self._layers = nn.ModuleList()
for _, hparams in enumerate(layer_hparams):
self._layers.append(get_layer(hparams=hparams))
for layer in self._layers:
layer_name = uniquify_str(layer.__class__.__name__,
self._layer_names)
self._layer_names.append(layer_name)
self._layers_by_name[layer_name] = layer
def append_layer(self, layer: Union[nn.Module, HParams, Dict[str, Any]]):
r"""Appends a layer to the end of the network.
Args:
layer: A subclass of :torch_nn:`Module`, or a dict of layer
hyperparameters.
"""
layer_ = layer
if not isinstance(layer_, nn.Module):
layer_ = get_layer(hparams=layer_)
self._layers.append(layer_)
layer_name = uniquify_str(layer_.__class__.__name__, self._layer_names)
self._layer_names.append(layer_name)
self._layers_by_name[layer_name] = layer_
def get_layer(hparams: Union[HParams, Dict[str, Any]]) -> nn.Module:
r"""Makes a layer instance.
The layer must be an instance of :torch_nn:`Module`.
Args:
hparams (dict or HParams): Hyperparameters of the layer, with
structure:
.. code-block:: python
{
"type": "LayerClass",
"kwargs": {
# Keyword arguments of the layer class
# ...
}
}
Here:
`"type"`: str or layer class or layer instance
The layer type. This can be
- The string name or full module path of a layer class. If
the class name is provided, the class must be in module
:torch_nn:`Module`, :mod:`texar.torch.core`, or
:mod:`texar.torch.custom`.
- A layer class.
- An instance of a layer class.
For example
.. code-block:: python
"type": "Conv1D" # class name
"type": "texar.torch.core.MaxReducePooling1D" # module path
"type": "my_module.MyLayer" # module path
"type": torch.nn.Module.Linear # class
"type": Conv1D(filters=10, kernel_size=2) # cell instance
"type": MyLayer(...) # cell instance
`"kwargs"`: dict
A dictionary of keyword arguments for constructor of the
layer class. Ignored if :attr:`"type"` is a layer instance.
- Arguments named "activation" can be a callable, or a `str` of
the name or module path to the activation function.
- Arguments named "\*_regularizer" and "\*_initializer" can be a
class instance, or a `dict` of hyperparameters of respective
regularizers and initializers. See
- Arguments named "\*_constraint" can be a callable, or a `str`
of the name or full path to the constraint function.
Returns:
A layer instance. If ``hparams["type"]`` is a layer instance, returns it
directly.
Raises:
ValueError: If :attr:`hparams` is `None`.
ValueError: If the resulting layer is not an instance of
:torch_nn:`Module`.
"""
if hparams is None:
raise ValueError("`hparams` must not be `None`.")
layer_type = hparams["type"]
if not is_str(layer_type) and not isinstance(layer_type, type):
layer = layer_type
else:
layer_modules = ["torch.nn", "texar.torch.core", "texar.torch.custom"]
layer_class: Type[nn.Module] = utils.check_or_get_class(
layer_type, layer_modules)
if isinstance(hparams, dict):
if (layer_class.__name__ == "Linear" and
"in_features" not in hparams["kwargs"]):
raise ValueError("\"in_features\" should be specified for "
"\"torch.nn.{}\"".format(layer_class.__name__))
elif (layer_class.__name__ in ["Conv1d", "Conv2d", "Conv3d"] and
"in_channels" not in hparams["kwargs"]):
raise ValueError("\"in_channels\" should be specified for "
"\"torch.nn.{}\"".format(layer_class.__name__))
default_kwargs = _layer_class_to_default_kwargs_map.get(
layer_class, {})
default_hparams = {"type": layer_type, "kwargs": default_kwargs}
hparams = HParams(hparams, default_hparams)
# this case needs to be handled separately because
# :torch_nn:`Sequential`
# does not accept kwargs
if layer_type == "Sequential":
names: List[str] = []
layer = nn.Sequential()
sub_hparams = hparams.kwargs.layers
for hparam in sub_hparams:
sub_layer = get_layer(hparam)
name = utils.uniquify_str(sub_layer._get_name(), names)
names.append(name)
layer.add_module(name=name, module=sub_layer)
else:
layer = utils.get_instance(layer_type, hparams.kwargs.todict(),
layer_modules)
if not isinstance(layer, nn.Module):
raise ValueError("layer must be an instance of `torch.nn.Module`.")
return layer
def _build_conv1d_hparams(self, in_channels, pool_hparams):
r"""Creates the hparams for each of the convolutional layers usable for
:func:`texar.torch.core.layers.get_layer`.
"""
nconv = self._hparams.num_conv_layers
if len(pool_hparams) != nconv:
raise ValueError("`pool_hparams` must be of length %d" % nconv)
in_channels = [in_channels]
out_channels = _to_list(self._hparams.out_channels, 'out_channels',
nconv)
# because in_channels(i) = out_channels(i-1)
in_channels.extend(out_channels[:-1])
if nconv == 1:
kernel_size = _to_list(self._hparams.kernel_size)
if not isinstance(kernel_size[0], (list, tuple)):
kernel_size = [kernel_size]
elif nconv > 1:
kernel_size = _to_list(self._hparams.kernel_size,
'kernel_size', nconv)
kernel_size = [_to_list(ks) for ks in kernel_size]
other_kwargs = self._hparams.other_conv_kwargs
if isinstance(other_kwargs, HParams):
other_kwargs = other_kwargs.todict()
other_kwargs = _to_list(other_kwargs, "other_conv_kwargs", nconv)
elif isinstance(other_kwargs, (list, tuple)):
if len(other_kwargs) != nconv:
raise ValueError("The length of hparams['other_conv_kwargs'] "
"must be equal to 'num_conv_layers'")
else:
raise ValueError("hparams['other_conv_kwargs'] must be a either "
"a dict or a list.")
def _activation_hparams(name, kwargs=None):
if kwargs is not None:
return {"type": name, "kwargs": kwargs}
else:
return {"type": name, "kwargs": {}}
conv_pool_hparams = []
for i in range(nconv):
hparams_i = []
names = []
if isinstance(other_kwargs[i], dict):
other_kwargs[i] = _to_list(other_kwargs[i], "other_kwargs[i]",
len(kernel_size[i]))
elif (isinstance(other_kwargs[i], (list, tuple))
and len(other_kwargs[i]) != len(kernel_size[i])):
raise ValueError("The length of hparams['other_conv_kwargs'][i]"
" must be equal to the length of "
"hparams['kernel_size'][i]")
for idx, ks_ij in enumerate(kernel_size[i]):
name = uniquify_str("conv_%d" % (i + 1), names)
names.append(name)
conv_kwargs_ij = {
"in_channels": in_channels[i],
"out_channels": out_channels[i],
"kernel_size": ks_ij
}
conv_kwargs_ij.update(other_kwargs[i][idx])
hparams_i.append(
{"type": "Conv1d", "kwargs": conv_kwargs_ij})
if len(hparams_i) == 1:
if self._hparams.conv_activation:
layers = {
"layers": [hparams_i[0],
_activation_hparams(
self._hparams.conv_activation,
self._hparams.conv_activation_kwargs)]}
sequential_layer = {"type": "Sequential", "kwargs": layers}
conv_pool_hparams.append([sequential_layer,
pool_hparams[i]])
else:
conv_pool_hparams.append([hparams_i[0], pool_hparams[i]])
else: # creates MergeLayer
mrg_kwargs_layers = []
for hparams_ij in hparams_i:
if self._hparams.conv_activation:
seq_kwargs_j = {
"layers": [
hparams_ij,
_activation_hparams(
self._hparams.conv_activation,
self._hparams.conv_activation_kwargs),
pool_hparams[i]
]
}
else:
seq_kwargs_j = {"layers": [hparams_ij, pool_hparams[i]]}
mrg_kwargs_layers.append(
{"type": "Sequential", "kwargs": seq_kwargs_j})
mrg_hparams = {"type": "MergeLayer",
"kwargs": {"layers": mrg_kwargs_layers}}
conv_pool_hparams.append(mrg_hparams)
return conv_pool_hparams
