FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -A placeholder is simply a variable that we will assign data to at a later date. It allows us to create our operations and build our computation graph, without needing the data. In TensorFlow terminology, we then feed data into the graph through these placeholders.

Detailed explanation-2: -Data placeholders are used to describe the mapping between the data retrieved from a data source and the layers composing the layout of a data-driven widget.

Detailed explanation-3: -A variable is a placeholder for information you want Python to recall later in the coding process when you need to complete an action. Technically, the variable acts as an address for where the data is stored in memory.

Detailed explanation-4: -These placeholders are called format specifiers. Many other format specifiers work with printf() . If we have a floating-point number, we can use %f to print out a floating-point number, decimal point and all. Other format specifiers are: %d-int (same as %i)