Using IEEE Citation style, how should I Cite a Figure, that was based on one in a text? In a lecture I watched,
I found a very good diagram that explains a concept I am trying to explain.
I couldn't get hold of the original image, so I recreated it in Tikz -- with a few changes to make it perfect for what I am doing.

This lecture is not a primary source for the concept explained in the diagram -- it uses ideas from other papers I am citing. Though I do cite it a few times, where the ideas it explained were clearer than the base texts (as well as citing the base texts).

In the caption should I put:


  ... , then generating all the layers below. Right: A DNN initialized using the DBN [1].


Or 


  ...  then generating all the layers below. Right: A DNN initialized using the DBN. This diagram based on one found in [1].


Or even -- since the caption is also drawing heavily on the lecture


  ...  then generating all the layers below. Right: A DNN initialized using the DBN[1]. This diagram based on one found in [1].


Where [1] is the index in my bibliography for the lecture.



Related: Creating a schematic figure based on an existing one
The most common way folks in my neck of the woods handle this would be to say "... A DNN initialized using the DBN (adapted from [1])."