make DepthAnythingV2 more reusable (#2675)

* make DepthAnythingV2 more reusable

* Fix clippy lints.

---------

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

candle-examples/examples/depth_anything_v2/main.rs

@@ -6,10 +6,8 @@ extern crate accelerate_src;
 #[cfg(feature = "mkl")]
 extern crate intel_mkl_src;
 
-use std::ffi::OsString;
-use std::path::PathBuf;
-
 use clap::Parser;
+use std::{ffi::OsString, path::PathBuf, sync::Arc};
 
 use candle::DType::{F32, U8};
 use candle::{DType, Device, Module, Result, Tensor};
@@ -82,7 +80,7 @@ pub fn main() -> anyhow::Result<()> {
     };
 
     let config = DepthAnythingV2Config::vit_small();
-    let depth_anything = DepthAnythingV2::new(&dinov2, &config, vb)?;
+    let depth_anything = DepthAnythingV2::new(Arc::new(dinov2), config, vb)?;
 
     let (original_height, original_width, image) = load_and_prep_image(&args.image, &device)?;
 

candle-transformers/src/models/depth_anything_v2.rs

@@ -4,6 +4,8 @@
 //! - ["Depth Anything: Unleashing the Power of Large-Scale Unlabeled Data"](https://github.com/LiheYoung/Depth-Anything)
 //!
 
+use std::sync::Arc;
+
 use candle::D::Minus1;
 use candle::{Module, Result, Tensor};
 use candle_nn::ops::Identity;
@@ -365,16 +367,18 @@ impl Scratch {
 
 const NUM_CHANNELS: usize = 4;
 
-pub struct DPTHead<'a> {
-    conf: &'a DepthAnythingV2Config,
+pub struct DPTHead {
     projections: Vec<Conv2d>,
     resize_layers: Vec<Box<dyn Module>>,
     readout_projections: Vec<Sequential>,
     scratch: Scratch,
+    use_class_token: bool,
+    input_image_size: usize,
+    target_patch_size: usize,
 }
 
-impl<'a> DPTHead<'a> {
-    pub fn new(conf: &'a DepthAnythingV2Config, vb: VarBuilder) -> Result<Self> {
+impl DPTHead {
+    pub fn new(conf: &DepthAnythingV2Config, vb: VarBuilder) -> Result<Self> {
         let mut projections: Vec<Conv2d> = Vec::with_capacity(conf.out_channel_sizes.len());
         for (conv_index, out_channel_size) in conf.out_channel_sizes.iter().enumerate() {
             projections.push(conv2d(
@@ -445,20 +449,22 @@ impl<'a> DPTHead<'a> {
         let scratch = Scratch::new(conf, vb.pp("scratch"))?;
 
         Ok(Self {
-            conf,
             projections,
             resize_layers,
             readout_projections,
             scratch,
+            use_class_token: conf.use_class_token,
+            input_image_size: conf.input_image_size,
+            target_patch_size: conf.target_patch_size,
         })
     }
 }
 
-impl Module for DPTHead<'_> {
+impl Module for DPTHead {
     fn forward(&self, xs: &Tensor) -> Result<Tensor> {
         let mut out: Vec<Tensor> = Vec::with_capacity(NUM_CHANNELS);
         for i in 0..NUM_CHANNELS {
-            let x = if self.conf.use_class_token {
+            let x = if self.use_class_token {
                 let x = xs.get(i)?.get(0)?;
                 let class_token = xs.get(i)?.get(1)?;
                 let readout = class_token.unsqueeze(1)?.expand(x.shape())?;
@@ -473,8 +479,8 @@ impl Module for DPTHead<'_> {
             let x = x.permute((0, 2, 1))?.reshape((
                 x_dims[0],
                 x_dims[x_dims.len() - 1],
-                self.conf.target_patch_size,
-                self.conf.target_patch_size,
+                self.target_patch_size,
+                self.target_patch_size,
             ))?;
             let x = self.projections[i].forward(&x)?;
 
@@ -515,25 +521,25 @@ impl Module for DPTHead<'_> {
 
         let out = self.scratch.output_conv1.forward(&path1)?;
 
-        let out = out.interpolate2d(self.conf.input_image_size, self.conf.input_image_size)?;
+        let out = out.interpolate2d(self.input_image_size, self.input_image_size)?;
 
         self.scratch.output_conv2.forward(&out)
     }
 }
 
-pub struct DepthAnythingV2<'a> {
-    pretrained: &'a DinoVisionTransformer,
-    depth_head: DPTHead<'a>,
-    conf: &'a DepthAnythingV2Config,
+pub struct DepthAnythingV2 {
+    pretrained: Arc<DinoVisionTransformer>,
+    depth_head: DPTHead,
+    conf: DepthAnythingV2Config,
 }
 
-impl<'a> DepthAnythingV2<'a> {
+impl DepthAnythingV2 {
     pub fn new(
-        pretrained: &'a DinoVisionTransformer,
-        conf: &'a DepthAnythingV2Config,
+        pretrained: Arc<DinoVisionTransformer>,
+        conf: DepthAnythingV2Config,
         vb: VarBuilder,
     ) -> Result<Self> {
-        let depth_head = DPTHead::new(conf, vb.pp("depth_head"))?;
+        let depth_head = DPTHead::new(&conf, vb.pp("depth_head"))?;
 
         Ok(Self {
             pretrained,
@@ -543,7 +549,7 @@ impl<'a> DepthAnythingV2<'a> {
     }
 }
 
-impl Module for DepthAnythingV2<'_> {
+impl Module for DepthAnythingV2 {
     fn forward(&self, xs: &Tensor) -> Result<Tensor> {
         let features = self.pretrained.get_intermediate_layers(
             xs,