For NeRF, It's mandatory that installing colmap.
However there are so many bugs....
I found that the reason of the bugs is ceres-solver.
So I tried dozens of versions, finally figured out the succeed version of ceres-solver.
And, I found that others had same trouble like me ISSUE.
So, I fixed the version.
Here is full code in Colab env
And COLMAP and ceres-solver
Note that even though official doc of colmap suggest dev branch, I used master branch.