CLIP model implementation with example (#1950)

* CLIP model implementation with example

* CLIP Implementation fixes, batch images

* CLIP model remove images from git

* CLIP model remove unnecessary use of batch_indices

candle-transformers/src/models/clip/mod.rs

@@ -0,0 +1,167 @@
+//! Contrastive Language-Image Pre-Training
+//!
+//! Contrastive Language-Image Pre-Training (CLIP) is an architecture trained on
+//! pairs of images with related texts.
+//!
+//! https://github.com/openai/CLIP
+//! https://github.com/huggingface/transformers/tree/f6fa0f0bf0796ac66f201f23bdb8585de1609add/src/transformers/models/clip
+use self::{
+    text_model::{Activation, ClipTextTransformer},
+    vision_model::ClipVisionTransformer,
+};
+use candle::{Result, Tensor, D};
+use candle_nn::Module;
+
+use tracing::warn;
+
+pub mod text_model;
+pub mod vision_model;
+
+pub struct ClipModel {
+    text_model: ClipTextTransformer,
+    vision_model: ClipVisionTransformer,
+    visual_projection: candle_nn::Linear,
+    text_projection: candle_nn::Linear,
+    logit_scale: Tensor,
+}
+
+pub enum EncoderConfig {
+    Text(text_model::ClipTextConfig),
+    Vision(vision_model::ClipVisionConfig),
+}
+
+impl EncoderConfig {
+    pub fn embed_dim(&self) -> usize {
+        match self {
+            Self::Text(c) => c.embed_dim,
+            Self::Vision(c) => c.embed_dim,
+        }
+    }
+
+    pub fn num_attention_heads(&self) -> usize {
+        match self {
+            Self::Text(c) => c.num_attention_heads,
+            Self::Vision(c) => c.num_attention_heads,
+        }
+    }
+
+    pub fn intermediate_size(&self) -> usize {
+        match self {
+            Self::Text(c) => c.intermediate_size,
+            Self::Vision(c) => c.intermediate_size,
+        }
+    }
+
+    pub fn num_hidden_layers(&self) -> usize {
+        match self {
+            Self::Text(c) => c.num_hidden_layers,
+            Self::Vision(c) => c.num_hidden_layers,
+        }
+    }
+
+    pub fn activation(&self) -> Activation {
+        match self {
+            Self::Text(_c) => Activation::QuickGelu,
+            Self::Vision(c) => c.activation,
+        }
+    }
+}
+
+pub struct ClipConfig {
+    pub text_config: text_model::ClipTextConfig,
+    pub vision_config: vision_model::ClipVisionConfig,
+    pub logit_scale_init_value: f32,
+    pub image_size: usize,
+}
+
+impl ClipConfig {
+    // base image size is 224, model size is 600Mb
+    pub fn vit_base_patch32() -> Self {
+        let text_config = text_model::ClipTextConfig::vit_base_patch32();
+        let vision_config = vision_model::ClipVisionConfig::vit_base_patch32();
+
+        Self {
+            text_config,
+            vision_config,
+            logit_scale_init_value: 2.6592,
+            image_size: 224,
+        }
+    }
+}
+
+impl ClipModel {
+    pub fn new(vs: candle_nn::VarBuilder, c: &ClipConfig) -> Result<Self> {
+        let text_model = ClipTextTransformer::new(vs.pp("text_model"), &c.text_config)?;
+
+        let vision_model = ClipVisionTransformer::new(vs.pp("vision_model"), &c.vision_config)?;
+
+        let visual_projection = candle_nn::linear_no_bias(
+            c.vision_config.embed_dim,
+            c.vision_config.projection_dim,
+            vs.pp("visual_projection"),
+        )?;
+
+        let text_projection = candle_nn::linear_no_bias(
+            c.text_config.embed_dim,
+            c.text_config.projection_dim,
+            vs.pp("text_projection"),
+        )?;
+
+        // originally nn.Parameter
+        let logit_scale = if vs.contains_tensor("logit_scale") {
+            vs.get(&[], "logit_scale")?
+        } else {
+            warn!("Creating logit_scale tensor, results may vary.");
+            Tensor::new(&[c.logit_scale_init_value], vs.device())?
+        };
+
+        Ok(Self {
+            text_model,
+            vision_model,
+            visual_projection,
+            text_projection,
+            logit_scale,
+        })
+    }
+
+    pub fn get_text_features(&self, input_ids: &Tensor) -> Result<Tensor> {
+        let text_outputs = self.text_model.forward(input_ids)?;
+
+        let text_features = self.text_projection.forward(&text_outputs)?;
+
+        Ok(text_features)
+    }
+
+    pub fn get_image_features(&self, pixel_values: &Tensor) -> Result<Tensor> {
+        let image_features = self.vision_model.forward(pixel_values)?;
+
+        let image_features = self.visual_projection.forward(&image_features)?;
+
+        Ok(image_features)
+    }
+
+    pub fn forward(&self, pixel_values: &Tensor, input_ids: &Tensor) -> Result<(Tensor, Tensor)> {
+        let image_features = self.get_image_features(pixel_values)?;
+
+        let text_features = self.get_text_features(input_ids)?;
+
+        let image_features_normalized = div_l2_norm(&image_features)?;
+
+        let text_features_normalized = div_l2_norm(&text_features)?;
+
+        let logits_per_text = text_features_normalized.matmul(&image_features_normalized.t()?)?;
+
+        let logit_scale = &self.logit_scale.exp()?;
+
+        let logits_per_text = logits_per_text.broadcast_mul(&logit_scale)?;
+
+        let logits_per_image = logits_per_text.t()?;
+
+        Ok((logits_per_text, logits_per_image))
+    }
+}
+
+pub fn div_l2_norm(v: &Tensor) -> Result<Tensor> {
+    let l2_norm = v.sqr()?.sum_keepdim(D::Minus1)?.sqrt()?;
+    v.broadcast_div(&l2_norm)
+}

candle-transformers/src/models/clip/text_model.rs

@@ -0,0 +1,355 @@
+//! Contrastive Language-Image Pre-Training
+//!
+//! Contrastive Language-Image Pre-Training (CLIP) is an architecture trained on
+//! pairs of images with related texts.
+//!
+//! https://github.com/openai/CLIP
+//! https://github.com/huggingface/transformers/tree/f6fa0f0bf0796ac66f201f23bdb8585de1609add/src/transformers/models/clip
+
+use candle::{DType, Device, IndexOp, Result, Tensor, D};
+use candle_nn as nn;
+use candle_nn::Module;
+
+use super::EncoderConfig;
+
+#[derive(Debug, Clone, Copy)]
+pub enum Activation {
+    QuickGelu,
+}
+
+impl Module for Activation {
+    fn forward(&self, xs: &Tensor) -> Result<Tensor> {
+        match self {
+            Activation::QuickGelu => xs * nn::ops::sigmoid(&(xs * 1.702f64)?)?,
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct ClipTextConfig {
+    pub vocab_size: usize,
+    pub embed_dim: usize,
+    pub activation: Activation,
+    pub intermediate_size: usize,
+    pub max_position_embeddings: usize,
+    pub pad_with: Option<String>,
+    pub num_hidden_layers: usize,
+    pub num_attention_heads: usize,
+    #[allow(dead_code)]
+    pub projection_dim: usize,
+}
+
+impl ClipTextConfig {
+    // The config details can be found in the "text_config" section of this json file:
+    // https://huggingface.co/openai/clip-vit-large-patch14/blob/main/config.json
+    pub fn vit_base_patch32() -> Self {
+        Self {
+            vocab_size: 49408,
+            embed_dim: 512,
+            intermediate_size: 2048,
+            max_position_embeddings: 77,
+            pad_with: None,
+            num_hidden_layers: 12,
+            num_attention_heads: 8,
+            projection_dim: 512,
+            activation: Activation::QuickGelu,
+        }
+    }
+}
+
+// ClipTextEmbeddings mostly based on the existing implementation in the stable diffision model.
+// TODO rewrite to be more similar to https://github.com/huggingface/transformers/blob/f6fa0f0bf0796ac66f201f23bdb8585de1609add/src/transformers/models/clip/modeling_clip.py#L142
+#[derive(Debug)]
+struct ClipTextEmbeddings {
+    token_embedding: candle_nn::Embedding,
+    position_embedding: candle_nn::Embedding,
+    position_ids: Tensor,
+}
+
+impl ClipTextEmbeddings {
+    fn new(vs: candle_nn::VarBuilder, c: &ClipTextConfig) -> Result<Self> {
+        let token_embedding =
+            candle_nn::embedding(c.vocab_size, c.embed_dim, vs.pp("token_embedding"))?;
+
+        let position_embedding: nn::Embedding = candle_nn::embedding(
+            c.max_position_embeddings,
+            c.embed_dim,
+            vs.pp("position_embedding"),
+        )?;
+
+        let position_ids =
+            Tensor::arange(0u32, c.max_position_embeddings as u32, vs.device())?.unsqueeze(0)?;
+
+        Ok(ClipTextEmbeddings {
+            token_embedding,
+            position_embedding,
+            position_ids,
+        })
+    }
+}
+
+impl Module for ClipTextEmbeddings {
+    fn forward(&self, input_ids: &Tensor) -> Result<Tensor> {
+        let seq_length = input_ids.dim(D::Minus1)?;
+
+        let inputs_embeds = &self.token_embedding.forward(input_ids)?;
+
+        let postion_ids = &self.position_ids.narrow(1, 0, seq_length)?;
+
+        let position_embedding = &self.position_embedding.forward(&postion_ids)?;
+
+        let inputs_embeds = inputs_embeds.broadcast_add(&position_embedding)?;
+
+        Ok(inputs_embeds)
+    }
+}
+
+#[derive(Debug)]
+struct ClipAttention {
+    k_proj: candle_nn::Linear,
+    v_proj: candle_nn::Linear,
+    q_proj: candle_nn::Linear,
+    out_proj: candle_nn::Linear,
+    head_dim: usize,
+    scale: f64,
+    num_attention_heads: usize,
+}
+
+impl ClipAttention {
+    fn new(vs: candle_nn::VarBuilder, c: &EncoderConfig) -> Result<Self> {
+        let embed_dim = c.embed_dim();
+        let num_attention_heads = c.num_attention_heads();
+        let k_proj = candle_nn::linear(embed_dim, embed_dim, vs.pp("k_proj"))?;
+        let v_proj = candle_nn::linear(embed_dim, embed_dim, vs.pp("v_proj"))?;
+        let q_proj = candle_nn::linear(embed_dim, embed_dim, vs.pp("q_proj"))?;
+        let out_proj = candle_nn::linear(embed_dim, embed_dim, vs.pp("out_proj"))?;
+        let head_dim = embed_dim / num_attention_heads;
+        let scale = (head_dim as f64).powf(-0.5);
+
+        Ok(ClipAttention {
+            k_proj,
+            v_proj,
+            q_proj,
+            out_proj,
+            head_dim,
+            scale,
+            num_attention_heads,
+        })
+    }
+
+    fn shape(&self, xs: &Tensor, seq_len: usize, bsz: usize) -> Result<Tensor> {
+        xs.reshape((bsz, seq_len, self.num_attention_heads, self.head_dim))?
+            .transpose(1, 2)?
+            .contiguous()
+    }
+
+    fn forward(&self, xs: &Tensor, causal_attention_mask: Option<&Tensor>) -> Result<Tensor> {
+        let in_dtype = xs.dtype();
+        let (bsz, seq_len, embed_dim) = xs.dims3()?;
+
+        let query_states = (self.q_proj.forward(xs)? * self.scale)?;
+        let proj_shape = (bsz * self.num_attention_heads, seq_len, self.head_dim);
+        let query_states = self
+            .shape(&query_states, seq_len, bsz)?
+            .reshape(proj_shape)?
+            .to_dtype(DType::F32)?;
+        let key_states = self
+            .shape(&self.k_proj.forward(xs)?, seq_len, bsz)?
+            .reshape(proj_shape)?
+            .to_dtype(DType::F32)?;
+        let value_states = self
+            .shape(&self.v_proj.forward(xs)?, seq_len, bsz)?
+            .reshape(proj_shape)?
+            .to_dtype(DType::F32)?;
+        let attn_weights = query_states.matmul(&key_states.transpose(1, 2)?)?;
+
+        let src_len = key_states.dim(1)?;
+
+        let attn_weights = if let Some(causal_attention_mask) = causal_attention_mask {
+            let attn_reshape =
+                attn_weights.reshape((bsz, self.num_attention_heads, seq_len, src_len))?;
+
+            let attn_weights = attn_reshape.broadcast_add(causal_attention_mask)?;
+
+            let attn_weights =
+                attn_weights.reshape((bsz * self.num_attention_heads, seq_len, src_len))?;
+
+            attn_weights
+        } else {
+            attn_weights
+        };
+
+        let attn_weights = candle_nn::ops::softmax(&attn_weights, D::Minus1)?;
+
+        let attn_output = attn_weights.matmul(&value_states)?.to_dtype(in_dtype)?;
+        let attn_output = attn_output
+            .reshape((bsz, self.num_attention_heads, seq_len, self.head_dim))?
+            .transpose(1, 2)?
+            .reshape((bsz, seq_len, embed_dim))?;
+        self.out_proj.forward(&attn_output)
+    }
+}
+
+#[derive(Debug)]
+struct ClipMlp {
+    fc1: candle_nn::Linear,
+    fc2: candle_nn::Linear,
+    activation: Activation,
+}
+
+impl ClipMlp {
+    fn new(vs: candle_nn::VarBuilder, c: &EncoderConfig) -> Result<Self> {
+        let fc1 = candle_nn::linear(c.embed_dim(), c.intermediate_size(), vs.pp("fc1"))?;
+        let fc2 = candle_nn::linear(c.intermediate_size(), c.embed_dim(), vs.pp("fc2"))?;
+
+        Ok(ClipMlp {
+            fc1,
+            fc2,
+            activation: c.activation(),
+        })
+    }
+}
+
+impl ClipMlp {
+    fn forward(&self, xs: &Tensor) -> Result<Tensor> {
+        let xs = self.fc1.forward(xs)?;
+        self.fc2.forward(&self.activation.forward(&xs)?)
+    }
+}
+
+#[derive(Debug)]
+struct ClipEncoderLayer {
+    self_attn: ClipAttention,
+    layer_norm1: candle_nn::LayerNorm,
+    mlp: ClipMlp,
+    layer_norm2: candle_nn::LayerNorm,
+}
+
+impl ClipEncoderLayer {
+    fn new(vs: candle_nn::VarBuilder, c: &EncoderConfig) -> Result<Self> {
+        let self_attn = ClipAttention::new(vs.pp("self_attn"), c)?;
+        let layer_norm1 = candle_nn::layer_norm(c.embed_dim(), 1e-5, vs.pp("layer_norm1"))?;
+        let mlp = ClipMlp::new(vs.pp("mlp"), c)?;
+        let layer_norm2 = candle_nn::layer_norm(c.embed_dim(), 1e-5, vs.pp("layer_norm2"))?;
+
+        Ok(ClipEncoderLayer {
+            self_attn,
+            layer_norm1,
+            mlp,
+            layer_norm2,
+        })
+    }
+
+    fn forward(&self, xs: &Tensor, causal_attention_mask: Option<&Tensor>) -> Result<Tensor> {
+        let residual = xs;
+        let xs = self.layer_norm1.forward(xs)?;
+        let xs = self.self_attn.forward(&xs, causal_attention_mask)?;
+        let xs = (xs + residual)?;
+
+        let residual = &xs;
+        let xs = self.layer_norm2.forward(&xs)?;
+        let xs = self.mlp.forward(&xs)?;
+        xs + residual
+    }
+}
+
+#[derive(Debug)]
+pub struct ClipEncoder {
+    layers: Vec<ClipEncoderLayer>,
+}
+
+impl ClipEncoder {
+    pub fn new(vs: candle_nn::VarBuilder, c: &EncoderConfig) -> Result<Self> {
+        let vs = vs.pp("layers");
+        let mut layers: Vec<ClipEncoderLayer> = Vec::new();
+        for index in 0..c.num_hidden_layers() {
+            let layer = ClipEncoderLayer::new(vs.pp(&index.to_string()), c)?;
+            layers.push(layer)
+        }
+        Ok(ClipEncoder { layers })
+    }
+
+    pub fn forward(&self, xs: &Tensor, causal_attention_mask: Option<&Tensor>) -> Result<Tensor> {
+        let mut xs = xs.clone();
+
+        for layer in self.layers.iter() {
+            xs = layer.forward(&xs, causal_attention_mask)?;
+        }
+        Ok(xs)
+    }
+}
+
+/// A CLIP transformer based model.
+#[derive(Debug)]
+pub struct ClipTextTransformer {
+    embeddings: ClipTextEmbeddings,
+    encoder: ClipEncoder,
+    final_layer_norm: candle_nn::LayerNorm,
+}
+
+impl ClipTextTransformer {
+    pub fn new(vs: candle_nn::VarBuilder, c: &ClipTextConfig) -> Result<Self> {
+        let embeddings = ClipTextEmbeddings::new(vs.pp("embeddings"), c)?;
+        let encoder = ClipEncoder::new(vs.pp("encoder"), &EncoderConfig::Text(c.clone()))?;
+        let final_layer_norm = candle_nn::layer_norm(c.embed_dim, 1e-5, vs.pp("final_layer_norm"))?;
+
+        Ok(ClipTextTransformer {
+            embeddings,
+            encoder,
+            final_layer_norm,
+        })
+    }
+
+    // TODO: rewrrite to newer version
+    fn build_causal_attention_mask(
+        bsz: usize,
+        seq_len: usize,
+        mask_after: usize,
+        device: &Device,
+    ) -> Result<Tensor> {
+        let mask: Vec<_> = (0..seq_len)
+            .flat_map(|i| {
+                (0..seq_len).map(move |j| {
+                    if j > i || j > mask_after {
+                        f32::MIN
+                    } else {
+                        0.
+                    }
+                })
+            })
+            .collect();
+        let mask = Tensor::from_slice(&mask, (seq_len, seq_len), device)?;
+        mask.broadcast_as((bsz, 1, seq_len, seq_len))
+    }
+
+    pub fn forward_with_mask(&self, input_ids: &Tensor, mask_after: usize) -> Result<Tensor> {
+        let (bsz, seq_len) = input_ids.dims2()?;
+        let input_ids = self.embeddings.forward(input_ids)?;
+
+        let causal_attention_mask =
+            Self::build_causal_attention_mask(bsz, seq_len, mask_after, input_ids.device())?;
+        let input_ids = self
+            .encoder
+            .forward(&input_ids, Some(&causal_attention_mask))?;
+        self.final_layer_norm.forward(&input_ids)
+    }
+}
+
+impl Module for ClipTextTransformer {
+    fn forward(&self, input_ids: &Tensor) -> Result<Tensor> {
+        let output = self.forward_with_mask(input_ids, usize::MAX)?;
+
+        let sequence_max_indices = input_ids.argmax(D::Minus1)?.to_dtype(DType::I64)?;
+
+        let mut indices: Vec<Tensor> = Vec::new();
+
+        for (batch_idx, &seq_idx) in sequence_max_indices.to_vec1::<i64>()?.iter().enumerate() {
+            let index = output.i((batch_idx, seq_idx as usize))?.unsqueeze(0)?;
+            indices.push(index);
+        }
+
+        let pooled_output = Tensor::cat(&indices, 0)?;
+
+        Ok(pooled_output)
+    }
+}

candle-transformers/src/models/clip/vision_model.rs

@@ -0,0 +1,171 @@
+//! Contrastive Language-Image Pre-Training
+//!
+//! Contrastive Language-Image Pre-Training (CLIP) is an architecture trained on
+//! pairs of images with related texts.
+//!
+//! https://github.com/openai/CLIP
+//! https://github.com/huggingface/transformers/tree/f6fa0f0bf0796ac66f201f23bdb8585de1609add/src/transformers/models/clip
+
+use candle::{IndexOp, Result, Shape, Tensor, D};
+use candle_nn as nn;
+use candle_nn::Module;
+use nn::Conv2dConfig;
+use tracing::warn;
+
+use super::{
+    text_model::{Activation, ClipEncoder},
+    EncoderConfig,
+};
+
+#[derive(Debug, Clone)]
+pub struct ClipVisionConfig {
+    pub embed_dim: usize,
+    pub activation: Activation,
+    pub intermediate_size: usize,
+    pub num_hidden_layers: usize,
+    pub num_attention_heads: usize,
+    #[allow(dead_code)]
+    pub projection_dim: usize,
+    pub num_channels: usize,
+    pub image_size: usize,
+    pub patch_size: usize,
+}
+
+impl ClipVisionConfig {
+    // The config details can be found in the "vision_config" section of this json file:
+    // https://huggingface.co/openai/clip-vit-large-patch14/blob/main/config.json
+    pub fn vit_base_patch32() -> Self {
+        Self {
+            embed_dim: 768,
+            activation: Activation::QuickGelu,
+            intermediate_size: 3072,
+            num_hidden_layers: 12,
+            num_attention_heads: 12,
+            projection_dim: 512,
+            num_channels: 3,
+            image_size: 224,
+            patch_size: 32,
+        }
+    }
+}
+
+// https://github.com/huggingface/transformers/blob/f6fa0f0bf0796ac66f201f23bdb8585de1609add/src/transformers/models/clip/modeling_clip.py#L112
+#[derive(Debug)]
+struct ClipVisionEmbeddings {
+    patch_embedding: candle_nn::Conv2d,
+    position_ids: Tensor,
+    class_embedding: Tensor,
+    position_embedding: candle_nn::Embedding,
+}
+
+impl ClipVisionEmbeddings {
+    fn new(vs: candle_nn::VarBuilder, c: &ClipVisionConfig) -> Result<Self> {
+        // originally nn.Parameter
+        let class_embedding = if vs.contains_tensor("class_embedding") {
+            vs.get(c.embed_dim, "class_embedding")?
+        } else {
+            warn!("class_embedding not found in the. Initializing a new one.");
+            Tensor::randn(0.0 as f32, 1.0 as f32, &[c.embed_dim], vs.device())?
+        };
+
+        let num_patches = (c.image_size / c.patch_size).pow(2);
+
+        let num_positions = num_patches + 1;
+
+        let position_ids = Tensor::arange(0, num_positions as i64, vs.device())?;
+
+        let conv2dconfig = Conv2dConfig {
+            stride: c.patch_size,
+            ..Default::default()
+        };
+        let position_embedding =
+            candle_nn::embedding(num_positions, c.embed_dim, vs.pp("position_embedding"))?;
+
+        let patch_embedding = candle_nn::conv2d_no_bias(
+            c.num_channels,
+            c.embed_dim,
+            c.patch_size,
+            conv2dconfig,
+            vs.pp("patch_embedding"),
+        )?;
+
+        Ok(Self {
+            patch_embedding,
+            position_ids,
+            class_embedding,
+            position_embedding,
+        })
+    }
+}
+
+impl Module for ClipVisionEmbeddings {
+    fn forward(&self, pixel_values: &Tensor) -> Result<Tensor> {
+        let batch_size = pixel_values.shape().dims();
+
+        let patch_embeds = self.patch_embedding.forward(&pixel_values)?;
+
+        let patch_embeds = patch_embeds.flatten_from(2)?;
+
+        let patch_embeds = patch_embeds.transpose(1, 2)?;
+
+        let class_embedding = self.class_embedding.clone();
+
+        let shape = Shape::from(vec![batch_size[0], 1, class_embedding.dim(D::Minus1)?]);
+
+        let class_embeds = class_embedding.expand(shape)?;
+
+        let embeddings = Tensor::cat(&[class_embeds, patch_embeds], 1)?;
+
+        let position_embedding = self.position_embedding.forward(&self.position_ids)?;
+
+        let embeddings = embeddings.broadcast_add(&position_embedding)?;
+
+        Ok(embeddings)
+    }
+}
+
+// https://github.com/huggingface/transformers/blob/f6fa0f0bf0796ac66f201f23bdb8585de1609add/src/transformers/models/clip/modeling_clip.py#L743
+#[derive(Debug)]
+pub struct ClipVisionTransformer {
+    embeddings: ClipVisionEmbeddings,
+    encoder: ClipEncoder,
+    pre_layer_norm: candle_nn::LayerNorm,
+    final_layer_norm: candle_nn::LayerNorm,
+}
+
+impl ClipVisionTransformer {
+    pub fn new(vs: candle_nn::VarBuilder, c: &ClipVisionConfig) -> Result<Self> {
+        let embeddings = ClipVisionEmbeddings::new(vs.pp("embeddings"), c)?;
+
+        let pre_layer_norm = candle_nn::layer_norm(c.embed_dim, 1e-5, vs.pp("pre_layrnorm"))?;
+
+        let encoder = ClipEncoder::new(vs.pp("encoder"), &EncoderConfig::Vision(c.clone()))?;
+
+        let final_layer_norm = candle_nn::layer_norm(c.embed_dim, 1e-5, vs.pp("post_layernorm"))?;
+
+        Ok(Self {
+            embeddings,
+            encoder,
+            final_layer_norm,
+            pre_layer_norm,
+        })
+    }
+}
+
+impl Module for ClipVisionTransformer {
+    fn forward(&self, pixel_values: &Tensor) -> Result<Tensor> {
+        let hidden_states = self.embeddings.forward(pixel_values)?;
+
+        let hidden_states = self.pre_layer_norm.forward(&hidden_states)?;
+
+        let encoder_outputs = self.encoder.forward(&hidden_states, None)?;
+
+        // https://github.com/huggingface/transformers/blob/f6fa0f0bf0796ac66f201f23bdb8585de1609add/src/transformers/models/clip/modeling_clip.py#L787
+        // pooled_output = encoder_outputs[:, 0, :]
+        let pooled_output = encoder_outputs.i((.., 0, ..))?;
+
+        let output = self.final_layer_norm.forward(&pooled_output)?;
+
+        Ok(output)
+    }
+}

candle-transformers/src/models/mod.rs

@@ -12,6 +12,7 @@ pub mod efficientvit;
 pub mod encodec;
 pub mod falcon;
 pub mod gemma;
+pub mod clip;
 pub mod jina_bert;
 pub mod llama;
 pub mod llama2_c;