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5 PyTorch functions you didn't know about

PyTorch is an open source machine learning library for Python. It has strong GPU support and it has already implemented many deep learning algorithms. We will have a closer look on few of the in built functions of this library:

  • numel
  • zeros
  • arange
  • reshape
  • transpose

Before we begin, let's install and import PyTorch

# Uncomment and run the appropriate command for your operating system, if required

# Linux / Binder
# !pip install numpy torch==1.7.0+cpu torchvision==0.8.1+cpu torchaudio==0.7.0 -f https://download.pytorch.org/whl/torch_stable.html

# Windows
!pip install numpy torch==1.7.0+cpu torchvision==0.8.1+cpu torchaudio==0.7.0 -f https://download.pytorch.org/whl/torch_stable.html

# MacOS
# !pip install numpy torch torchvision torchaudio
Looking in links: https://download.pytorch.org/whl/torch_stable.html Requirement already satisfied: numpy in /usr/local/lib/python3.6/dist-packages (1.18.5) Collecting torch==1.7.0+cpu Downloading https://download.pytorch.org/whl/cpu/torch-1.7.0%2Bcpu-cp36-cp36m-linux_x86_64.whl (159.3MB) |████████████████████████████████| 159.3MB 56kB/s Collecting torchvision==0.8.1+cpu Downloading https://download.pytorch.org/whl/cpu/torchvision-0.8.1%2Bcpu-cp36-cp36m-linux_x86_64.whl (11.8MB) |████████████████████████████████| 11.8MB 57.0MB/s Collecting torchaudio==0.7.0 Downloading https://files.pythonhosted.org/packages/3f/23/6b54106b3de029d3f10cf8debc302491c17630357449c900d6209665b302/torchaudio-0.7.0-cp36-cp36m-manylinux1_x86_64.whl (7.6MB) |████████████████████████████████| 7.6MB 8.8MB/s Requirement already satisfied: future in /usr/local/lib/python3.6/dist-packages (from torch==1.7.0+cpu) (0.16.0) Requirement already satisfied: typing-extensions in /usr/local/lib/python3.6/dist-packages (from torch==1.7.0+cpu) (3.7.4.3) Requirement already satisfied: dataclasses in /usr/local/lib/python3.6/dist-packages (from torch==1.7.0+cpu) (0.8) Requirement already satisfied: pillow>=4.1.1 in /usr/local/lib/python3.6/dist-packages (from torchvision==0.8.1+cpu) (7.0.0) Installing collected packages: torch, torchvision, torchaudio Found existing installation: torch 1.7.0+cu101 Uninstalling torch-1.7.0+cu101: Successfully uninstalled torch-1.7.0+cu101 Found existing installation: torchvision 0.8.1+cu101 Uninstalling torchvision-0.8.1+cu101: Successfully uninstalled torchvision-0.8.1+cu101 Successfully installed torch-1.7.0+cpu torchaudio-0.7.0 torchvision-0.8.1+cpu 
# Import torch and other required modules
import torch

Function 1 - torch.numel

This method takes a tensor as input and returns the total number of elements in the input tensor.