Problem compiling Ch. 6's face-detection-tf project

[pjkennedy]

Cannot compile: practical-machine-learning-w-rust/chapter6/face-detection-tf

$ cargo run
Compiling imageproc v0.18.0
error[E0034]: multiple applicable items in scope
--> /home/px/.cargo/registry/src/github.com-1ecc6299db9ec823/imageproc-0.18.0/src/hog.rs:440:35
|
440 | let intensity = ::clamp(hist[bucket]);
| ^^^^^ multiple clamp found
|
= note: candidate #1 is defined in an impl of the trait Ord for the type u8
note: candidate #2 is defined in the trait Clamp
--> /home/px/.cargo/registry/src/github.com-1ecc6299db9ec823/imageproc-0.18.0/src/definitions.rs:68:5
|
68 | fn clamp(x: T) -> Self;
| ^^^^^^^^^^^^^^^^^^^^^^^
help: disambiguate the associated function for candidate #1
|
440 | let intensity = ::clamp(hist[bucket]);
| ~~~~~~~~~~~~~
help: disambiguate the associated function for candidate #2
|
440 | let intensity = ::clamp(hist[bucket]);
| ~~~~~~~~~~~~~~~

error[E0034]: multiple applicable items in scope
--> /home/px/.cargo/registry/src/github.com-1ecc6299db9ec823/imageproc-0.18.0/src/hog.rs:444:35
|
444 | let intensity = ::clamp(hist[bucket]);
| ^^^^^ multiple clamp found
|
= note: candidate #1 is defined in an impl of the trait Ord for the type u8
note: candidate #2 is defined in the trait Clamp
--> /home/px/.cargo/registry/src/github.com-1ecc6299db9ec823/imageproc-0.18.0/src/definitions.rs:68:5
|
68 | fn clamp(x: T) -> Self;
| ^^^^^^^^^^^^^^^^^^^^^^^
help: disambiguate the associated function for candidate #1
|
444 | let intensity = ::clamp(hist[bucket]);
| ~~~~~~~~~~~~~
help: disambiguate the associated function for candidate #2
|
444 | let intensity = ::clamp(hist[bucket]);
| ~~~~~~~~~~~~~~~

For more information about this error, try rustc --explain E0034.
error: could not compile imageproc due to 2 previous errors

How do I disambiguate per info from E0034? Type u8 is std::u8, so I'm not sure why it's related to a trait issue that needs to be disambiguated. I'm new to Rust, so hoping to get a pointer or help on this. Seems like there's a bug in the code. Thank you.