Update README.md

README.md

@@ -38,7 +38,7 @@ If you do not have required computation devices and still wants an online soluti
 
 We currently release two models `paints_undo_single_frame` and `paints_undo_multi_frame`. Let's call them single-frame model and multi-frame model.
 
-The single-frame model takes one image and an `operation step` as input, and outputs one single image. Assuming that an artwork can always be created with 1000 human operations (for example, one brush stroke is one operation), and the `operation step` is an int number from 0 to 999. The number 0 is the finished final artwork, and the number 999 is the first brush stroke drawn on the pure white canvas. You can understand this model as an "undo" (or called Ctrl+Z) model. You input the final image, and indicate how many times you want to "Ctrl+Z", and the model will give you a "simulated" screenshot after those "Ctrl+Z"s are pressed. If your `operation step` is 100, then it means you want to simulate "Ctrl+Z" 100 times on this image get the appearance after the 100-th "Ctrl+Z".
+The single-frame model takes one image and an `operation step` as input, and outputs one single image. Assuming that an artwork can always be created with 1000 human operations (for example, one brush stroke is one operation), and the `operation step` is an int number from 0 to 999. The number 0 is the finished final artwork, and the number 999 is the first brush stroke drawn on the pure white canvas. You can understand this model as an "undo" (or called Ctrl+Z) model. You input the final image, and indicate how many times you want to "Ctrl+Z", and the model will give you a "simulated" screenshot after those "Ctrl+Z"s are pressed. If your `operation step` is 100, then it means you want to simulate "Ctrl+Z" 100 times on this image to get the appearance after the 100-th "Ctrl+Z".
 
 The multi-frame model takes two images as inputs and output 16 intermediate frames between the two input images. The result is much more consistent than the single-frame model, but also much slower, less "creative", and limited in 16 frames.