PyTorch Packages

PyTorch is an optimized tensor library for deep learning using CPUs and GPUs. PyTorch has a rich set of packages which are used to perform deep learning concepts. These packages help us in optimization, conversion, and loss calculation, etc. Let's get a brief knowledge of these packages.

S.No	Name	Description
1.	Torch	The torch package includes data structure for multi-dimensional tensors and mathematical operation over these are defined.
2.	torch.Tensor	This package is a multi-dimensional matrix which contains an element of a single data type.
3.	Tensor Attributes
	a) torch.dtype	It is an object which represents the datatype of thetorch.Tensor.
	b) torch.device	It is an object that represents the device on which torch.Tensor will be allocated.
	c) torch.layout	It is an object which represents a memory layout of a toch.Tensor.
4.	Type Info	The numerical properties of a torch.dtype will be accessed through either the torch.iinfo or the torch.finfo.
	1) torch.finfo	It is an object which represents the numerical properties of a floating-point torch.dtype.
	2) torch.iinfo	It is an object which represents the numerical properties of an integer torch.dtype.
5.	torch.sparse	Torch supports sparse tensors in COO (rdinate) format, which will efficiently store and process tensors for which the majority of elements are zero.
6.	torch.cuda	Torch supports for CUDA tensor types which implement the same function as CPU tensors, but for computation they utilize GPUs.
7.	torch.Storage	A torch.Storage is a contiguous, one-dimensional array of a single data type.
8.	torch.nn	This package provides us many more classes and modules to implement and train the neural network.
9.	torch.nn.functional	This package has functional classes which are similar to torch.nn.
10.	torch.optim	This package is used to implement various optimization algorithm.
11.	torch.autogard	This package provides classes and functions to implement automatic differentiation of arbitrary scalar value functions.
12.	torch.distributed	This package supports three backends and each one is with different capabilities.
13.	torch.distribution	This package allows us to construct the stochastic computation graphs, and stochastic gradient estimators for optimization
14.	torch.hub	It is a pre-trained model repository which is designed to facilitate research reproducibility.
15.	torch.multiprocessing	It is a wrapper around the native multiprocessing module.
16.	torch.utils.bottleneck	It is a tool which can be used as an initial step for debugging bottlenecks in our program.
17.	torch.utils.checkpoint	It is used to create checkpoint in our source program.
18.	torch.tils.cpp_extension	It is used to create the extension of C++, CUDA, and other languages.
19.	torch.utils.data	This package is mainly used for creating the dataset.
20.	torch.utils.dlpack	It will use to decode the Dlpack into tensor.
21.	torch.onnx	The ONNX exporter is a trace-based exporter, which means that it operates by executing your model once and exporting the operators which were actually run during this run