in offline i were taught conv2d and here sir is using convolution2d .Is they are different (online they are showing conv as class and other one as variable)
Difference between conv2d and convolution 2d
hey @himanshu_raw ,
there is no difference between these both .
They are both used as same .
But , if you would be using them with tensorflow while a model from scratch with core data structures. Then in that case , conv2d is low level api , which doesn’t contains much functions on it own , and you need to build them for proper functioning, whereas Convolution2D is high level API which provides many functions which can directly be called to perform some task , instead of building them individually.
I hope this would have helped you.
Thank You and Happy Learning 
.