Depth Anything v2 (#2279)

* define structs

* construct ResidualConvUnit

* forward() for ResidualConvUnit

* implement FeatureFusionBlock

* implement Scratch

* implement DPTHead

* add identity module

* implement forward for DTPHead

* add get_intermediate_layers to DinoVisionTransformer

* implement DepthAnythingV2

* some minor tweaks

* fix compile errors

* fix var builder prefixes

* setup initial example

* use fixed patch size of 37 (518 / 14)

* debugged until output

* print min and max values

* add some dynamism to the output location

* scale input image

* extract prep function

* extract output path function

* normalize image with magic mean and std

* add spectral coloring

* squeeze in the right place

* make enterpolation optional

* use bail instead of panic

* omit unnecessary Shape call

* remove empty curly braces

* use bail instead of assert

* use vb and pp

* remove closures

* extract config object

* Apply rustfmt.

* Fix some clippy lints.

* More lints.

* Use the array methods.

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Co-authored-by: laurent <laurent.mazare@gmail.com>

candle-transformers/src/models/mod.rs

@@ -6,6 +6,7 @@ pub mod chatglm;
 pub mod clip;
 pub mod convmixer;
 pub mod convnext;
+pub mod depth_anything_v2;
 pub mod dinov2;
 pub mod distilbert;
 pub mod efficientnet;