def Tensor(*, data: Union[np.ndarray, Any], trainable: bool) -> ITensor:
"""
Create a babilim tensor from a native tensor or numpy array.
:param data: The data that should be put in a babilim tensor. This can be either a numpy array or a pytorch/tensorflow tensor.
:param trainable: If the tensor created should be trainable. Only works for numpy tensors, native tensors overwrite this field!
:return: An object of type babilim.core.ITensor.
"""
if babilim.get_backend() == PYTORCH_BACKEND:
from babilim.core.tensor_pt import Tensor as _Tensor
from torch import Tensor as _PtTensor
native = None
if isinstance(data, _PtTensor):
native = data
data = None
return _Tensor(data, trainable, native)
elif babilim.get_backend() == TF_BACKEND:
from babilim.core.tensor_tf import Tensor as _Tensor
from tensorflow import Tensor as _TfTensor
native = None
if isinstance(data, _TfTensor):
native = data
data = None
return _Tensor(data, trainable, native)
else:
raise RuntimeError(
"No variable implementation for this backend was found. (backend={})"
.format(babilim.get_backend()))
def call(self, *args, **kwargs) -> Any:
"""
Makes a module callable and contains the forward pass of your model.
This should be pure computation and not allocate any weights.
Allocating weights should be done in the `build` function.
This function gets called by `__call__` and itself passes all calls to `_call_pytorch` and `_call_tf`.
Furthermore, it takes care of unwrapping the tensors into native tensors before calling and wrapping them again after calling.
This allows the native functions `_call_pytorch` and `_call_tf` to be pure pytorch or tensorflow code.
All subclasses must implement `_call_pytorch` and `_call_tf`.
You should call this module in the following style (this ensures the module is build on first run):
```
module = MyModule()
result = module(*args, **kwargs)
```
Parameters:
:param *args: You can specify any parameters you want.
:param **kwargs: You can specify any named parameters you want.
"""
args = self._wrapper.unwrap(args)
kwargs = self._wrapper.unwrap(kwargs)
if is_backend(PYTORCH_BACKEND):
results = self._call_pytorch(*args, **kwargs)
elif is_backend(TF_BACKEND):
results = self._call_tf(*args, **kwargs)
else:
raise RuntimeError("Unknown Backend: {}".format(get_backend()))
results = self._wrapper.wrap(results)
return results
def build(self, *args, **kwargs) -> None:
"""
Build the model, this function automatically calls the native build with the tensors unwrapped.
This function gets called by `__call__` and itself passes all calls to `_build_pytorch` and `_build_tf`.
Furthermore, it takes care of unwrapping the tensors into native tensors before calling and wrapping them again after calling.
This allows the native functions `_build_pytorch` and `_build_tf` to be pure pytorch or tensorflow code.
All subclasses must implement `_build_pytorch` and `_build_tf`.
You should never call the build function directly. Call this module in the following style (this ensures the module is build on first run):
```
module = MyModule()
result = module(*args, **kwargs) # <- Build gets called internally here.
```
Parameters:
:param *args: You must specify the exact same parameters as for your call.
:param **kwargs: You must specify the exact same parameters as for your call.
"""
args = self._wrapper.unwrap(args)
kwargs = self._wrapper.unwrap(kwargs)
if is_backend(PYTORCH_BACKEND):
self._build_pytorch(*args, **kwargs)
elif is_backend(TF_BACKEND):
self._build_tf(*args, **kwargs)
else:
raise RuntimeError("Unknown Backend: {}".format(get_backend()))
def GradientTape(variables: List) -> object:
"""
Collect the gradients for the block within a with statement.
:param variables: The variables for which the gradients should be tracked.
"""
if babilim.get_backend() == PYTORCH_BACKEND:
from babilim.core.gradient_tape_pt import GradientTapePT
return GradientTapePT(variables)
elif babilim.get_backend() == TF_BACKEND:
from babilim.core.gradient_tape_tf import GradientTapeTF
return GradientTapeTF(variables)
else:
raise RuntimeError(
"No variable implementation for this backend was found. (backend={})"
.format(babilim.get_backend()))
def TensorWrapper() -> ITensorWrapper:
"""
Create a tensor wrapper object.
Sometimes it is nescesarry to implement stuff in native pytorch or native tensorflow. Here the tensor wrapper can help.
**WARNING: Instead of directly using the TensorWrapper, you should prefer using the babilim.module.Lambda!**
"""
if babilim.get_backend() == PYTORCH_BACKEND:
from babilim.core.tensor_pt import TensorWrapper as _TensorWrapper
return _TensorWrapper()
elif babilim.get_backend() == TF_BACKEND:
from babilim.core.tensor_tf import TensorWrapper as _TensorWrapper
return _TensorWrapper()
else:
raise RuntimeError(
"No variable implementation for this backend was found. (backend={})"
.format(babilim.get_backend()))
def __exit__(self, type, value, traceback):
_device_stack.pop()
if babilim.is_backend(TF_BACKEND):
self.native_device.__exit__()
self.native_device = None
elif babilim.is_backend(PYTORCH_BACKEND):
pass
else:
raise RuntimeError(
"No implementation for this backend was found. (backend={})".
format(babilim.get_backend()))
def __enter__(self):
_device_stack.append(self.name)
if babilim.is_backend(TF_BACKEND):
import tensorflow as tf
self.native_device = tf.device(get_current_device_native_format())
self.native_device.__enter__()
elif babilim.is_backend(PYTORCH_BACKEND):
pass
else:
raise RuntimeError(
"No implementation for this backend was found. (backend={})".
format(babilim.get_backend()))
return self
def get_current_device_native_format() -> str:
"""
Get a string specifying the currently selected default device in the backend specific native format.
When you manually assign a device, you should always use this device.
"""
name = _device_stack[-1]
if babilim.is_backend(TF_BACKEND):
return "/" + name
elif babilim.is_backend(PYTORCH_BACKEND):
import torch
if torch.cuda.is_available():
return name.replace("gpu", "cuda")
else:
return "cpu"
else:
raise RuntimeError(
"No implementation for this backend was found. (backend={})".
format(babilim.get_backend()))