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# Chapter 2. Introduction to TensorFlow Primitives

This chapter will introduce you to fundamental aspects of TensorFlow. In particular, you will learn how to perform basic computation using TensorFlow. A large part of this chapter will be spent introducing the concept of tensors, and discussing how tensors are represented and manipulated within TensorFlow. This discussion will necessitate a brief overview of some of the mathematical concepts that underly tensorial mathematics. In particular, we’ll briefly review basic linear algebra and demonstrate how to perform basic linear algebraic operations with TensorFlow.

We’ll follow this discussion of basic mathematics with a discussion of the differences between declarative and imperative programming styles. Unlike many programming languages, TensorFlow is largely declarative. Calling a TensorFlow operation adds a description of a computation to TensorFlow’s “computation graph”. In particular, TensorFlow code “describes” computations and doesn’t actually perform them. In order to run TensorFlow code, users need to create `tf.Session` objects. We introduce the concept of sesions and describe how users can use them to perform computations in TensorFlow.

We end the chapter by discussing the notion of variables. Variables in TensorFlow hold tensors and allow for stateful computation that modifies variables to occur. We demonstrate how to create variables and update their values via TensorFlow.

# Introducing Tensors

Tensors are fundamental mathematical ...

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