float --single precision (32bit) floating point type

"Float" is a single precision (32bit) floating point type. Single precision simply means 32bit. Floating point is a form of software representation of a decimal, and in the IEEE 754 format, it consists of a sign part, a mantissa part, and an exponent part. Think of the mantissa as the number of significant digits.

# Single precision (32bit) floating point type
float

The maximum value of a floating point number that can be represented by a single precision (32bit) floating point type is defined by FTL_MAX, and the minimum value is defined by FLT_MIN.

float sample code

This is a sample code using float. The "f" suffix is specified to clearly indicate that the type of the floating-point literal is a float type.

#include <stdio.h>
#include <stdint.h>

int main (void) {
  float num = 5.4f;
  
  printf("%f\n", num);
}

"%F" is used in the format specifier of printf function.

Output result.

5.400000

16-bit wide integers can be represented by floats

Float is a floating point type, but since an integer is a floating point value, it can also represent an integer.

Keep in mind that the number is a 16-bit wide integer ( int16_t, uint16_t) means that it can be expressed by float. On the other hand, 32-bit wide integers ( int32_t, uint32_t) are available on float. It cannot be expressed and requires a double.

Relationship between float type, deep learning and GPU

Deep learning uses the GPU to perform calculations to speed up the calculation process. GPU processing is typically parallel computing of float-width numbers. The GPU was originally a processor for screen display, and each unit has a float width in order to increase the density and perform parallel calculations. This was a good match for the numerical calculations required for deep learning. You can also GPU / CUDA binding in Perl.

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