# Solved: pytorch get tensor dimension Get Tensor Dimension in Python: Understanding the Concept and Implementation

Tensors are multi-dimensional arrays that are widely used in various fields such as machine learning, deep learning, and computer vision. Often, it becomes essential to know the dimensions or shape of a tensor to perform operations like reshaping, broadcasting, and so on. In this article, we will dive into the process of getting tensor dimensions using Python, with a step-by-step explanation of the code, and explore some related libraries and functions that play a critical role in tensor manipulation.

To solve the problem of getting tensor dimensions, we will be using the widely popular library NumPy and its built-in function shape. To get started, let’s first import the NumPy library and create a sample tensor.

```import numpy as np

tensor = np.array([[[1, 2, 3], [4, 5, 6]], [[7, 8, 9], [10, 11, 12]]])
```

Now that we have our tensor, we can effortlessly obtain its dimensions using the shape attribute.

```tensor_dimensions = tensor.shape
print("Tensor dimensions:", tensor_dimensions)
```

This code snippet would output the following:

“`
Tensor dimensions: (2, 2, 3)
“`

The tensor_dimensions variable now contains the dimensions of our tensor in a tuple format (2, 2, 3). To further understand the obtained result, let’s dissect the code step by step.

## NumPy Library

• NumPy is a powerful Python library that provides support for working with large, multi-dimensional arrays and matrices. It comes with a collection of mathematical functions to perform operations on these arrays.
• It has become a base for various scientific computing packages and libraries, especially in the field of machine learning and data analysis.

## Creating a Tensor with NumPy

In our example, we created a 3D tensor using the np.array function. This function takes a list of lists (or other array-like structures) as input and converts it into a multi-dimensional array or tensor.

```tensor = np.array([[[1, 2, 3], [4, 5, 6]], [[7, 8, 9], [10, 11, 12]]])
```

The created tensor has a shape of (2, 2, 3), where the first dimension represents the number of nested lists, the second dimension stands for the number of inner lists in each nested list, and the third dimension indicates the number of elements in each inner list.

## Using the Shape Attribute

The shape attribute available in NumPy helps us obtain the dimensions of our tensor without any hassle.

```tensor_dimensions = tensor.shape
```

tensor.shape returns a tuple representing the dimensions of the tensor in the format (dimension_1, dimension_2, …, dimension_n).

In conclusion, getting tensor dimensions in Python is quite simple and efficient, especially with the help of the NumPy library. By understanding the shape attribute and utilizing the various built-in functions, we can solve a wide range of problems related to tensors and their dimensions.

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