Add DINOv2 model (#334)

Co-authored-by: Jonatan Kłosko <[email protected]>

Author: joelpaulkoch

lib/bumblebee.ex

@@ -123,6 +123,9 @@ defmodule Bumblebee do
       {Bumblebee.Vision.Deit, :for_image_classification_with_teacher},
     "DeiTForMaskedImageModeling" => {Bumblebee.Vision.Deit, :for_masked_image_modeling},
     "DeiTModel" => {Bumblebee.Vision.Deit, :base},
+    "Dinov2Model" => {Bumblebee.Vision.DinoV2, :base},
+    "Dinov2Backbone" => {Bumblebee.Vision.DinoV2, :backbone},
+    "Dinov2ForImageClassification" => {Bumblebee.Vision.DinoV2, :for_image_classification},
     "DistilBertModel" => {Bumblebee.Text.Distilbert, :base},
     "DistilBertForMaskedLM" => {Bumblebee.Text.Distilbert, :for_masked_language_modeling},
     "DistilBertForSequenceClassification" =>
@@ -203,7 +206,8 @@ defmodule Bumblebee do
   }
 
   @transformers_image_processor_type_to_featurizer %{
-    "BlipImageProcessor" => Bumblebee.Vision.BlipFeaturizer
+    "BlipImageProcessor" => Bumblebee.Vision.BlipFeaturizer,
+    "BitImageProcessor" => Bumblebee.Vision.BitFeaturizer
   }
 
   @model_type_to_featurizer %{

lib/bumblebee/diffusion/layers/unet.ex

@@ -323,7 +323,7 @@ defmodule Bumblebee.Diffusion.Layers.UNet do
         epsilon: 1.0e-5
       ],
       dropout_rate: dropout,
-      ffn: &ffn_geglu(&1, hidden_size, dropout: dropout, name: &2),
+      ffn: &ffn_geglu(&1, 4 * hidden_size, hidden_size, dropout: dropout, name: &2),
       block_type: :norm_first,
       name: join(name, "blocks")
     )
@@ -347,12 +347,10 @@ defmodule Bumblebee.Diffusion.Layers.UNet do
   end
 
   # A feed-forward network with GEGLU nonlinearity as in https://arxiv.org/abs/2002.05202
-  defp ffn_geglu(x, size, opts) do
+  defp ffn_geglu(x, intermediate_size, output_size, opts) do
     name = opts[:name]
     dropout = opts[:dropout] || 0.0
 
-    intermediate_size = 4 * size
-
     {x, gate} =
       x
       |> Axon.dense(intermediate_size * 2, name: join(name, "intermediate"))
@@ -362,6 +360,6 @@ defmodule Bumblebee.Diffusion.Layers.UNet do
 
     x
     |> Axon.dropout(rate: dropout, name: join(name, "dropout"))
-    |> Axon.dense(size, name: join(name, "output"))
+    |> Axon.dense(output_size, name: join(name, "output"))
   end
 end

lib/bumblebee/layers/transformer.ex

@@ -265,6 +265,10 @@ defmodule Bumblebee.Layers.Transformer do
         * `:parallel` - block with attention and FFN independently (in parallel).
           This type doesn't support cross-attention
 
+      Alternatively a custom 3-arity function may be given. The function
+      receives the input hidden state, a map with block steps and a
+      name to prefix any additional layers.
+
     * `:scale_attention_weights` - whether to scale query in the traditional style of
       multi-headed attention. Defaults to `true`
 
@@ -469,17 +473,25 @@ defmodule Bumblebee.Layers.Transformer do
 
     ffn = &ffn_fun.(&1, join(name, "ffn"))
 
+    block_impl =
+      case block_type do
+        type when is_atom(type) -> &block_impl(type, &1, &2, &3)
+        fun when is_function(fun) -> fun
+      end
+
     {hidden_state, attention_info, cross_attention_info} =
-      block_impl(
-        block_type,
+      block_impl.(
         hidden_state,
-        self_attention_norm,
-        self_attention,
-        cross_attention_maybe,
-        cross_attention_norm,
-        cross_attention,
-        output_norm,
-        ffn
+        %{
+          self_attention_norm: self_attention_norm,
+          self_attention: self_attention,
+          cross_attention_maybe: cross_attention_maybe,
+          cross_attention_norm: cross_attention_norm,
+          cross_attention: cross_attention,
+          output_norm: output_norm,
+          ffn: ffn
+        },
+        name
       )
 
     {attention, self_attention_cache, attention_relative_bias} = attention_info
@@ -495,36 +507,26 @@ defmodule Bumblebee.Layers.Transformer do
     {hidden_state, attention, cross_attention, block_cache, attention_relative_bias}
   end
 
-  defp block_impl(
-         :standard,
-         hidden_state,
-         self_attention_norm,
-         self_attention,
-         cross_attention_maybe,
-         cross_attention_norm,
-         cross_attention,
-         output_norm,
-         ffn
-       ) do
+  defp block_impl(:standard, hidden_state, steps, _name) do
     shortcut = hidden_state
 
-    {hidden_state, attention_info} = self_attention.(hidden_state)
+    {hidden_state, attention_info} = steps.self_attention.(hidden_state)
 
     hidden_state =
       hidden_state
       |> Axon.add(shortcut)
-      |> self_attention_norm.()
+      |> steps.self_attention_norm.()
 
     {hidden_state, cross_attention_info} =
-      cross_attention_maybe.(hidden_state, fn hidden_state ->
+      steps.cross_attention_maybe.(hidden_state, fn hidden_state ->
         shortcut = hidden_state
 
-        {hidden_state, cross_attention_info} = cross_attention.(hidden_state)
+        {hidden_state, cross_attention_info} = steps.cross_attention.(hidden_state)
 
         hidden_state =
           hidden_state
           |> Axon.add(shortcut)
-          |> cross_attention_norm.()
+          |> steps.cross_attention_norm.()
 
         {hidden_state, cross_attention_info}
       end)
@@ -533,41 +535,31 @@ defmodule Bumblebee.Layers.Transformer do
 
     hidden_state =
       hidden_state
-      |> ffn.()
+      |> steps.ffn.()
       |> Axon.add(shortcut)
-      |> output_norm.()
+      |> steps.output_norm.()
 
     {hidden_state, attention_info, cross_attention_info}
   end
 
-  defp block_impl(
-         :norm_first,
-         hidden_state,
-         self_attention_norm,
-         self_attention,
-         cross_attention_maybe,
-         cross_attention_norm,
-         cross_attention,
-         output_norm,
-         ffn
-       ) do
+  defp block_impl(:norm_first, hidden_state, steps, _name) do
     shortcut = hidden_state
 
     {hidden_state, attention_info} =
       hidden_state
-      |> self_attention_norm.()
-      |> self_attention.()
+      |> steps.self_attention_norm.()
+      |> steps.self_attention.()
 
     hidden_state = Axon.add(hidden_state, shortcut)
 
     {hidden_state, cross_attention_info} =
-      cross_attention_maybe.(hidden_state, fn hidden_state ->
+      steps.cross_attention_maybe.(hidden_state, fn hidden_state ->
         shortcut = hidden_state
 
         {hidden_state, cross_attention_info} =
           hidden_state
-          |> cross_attention_norm.()
-          |> cross_attention.()
+          |> steps.cross_attention_norm.()
+          |> steps.cross_attention.()
 
         hidden_state = Axon.add(hidden_state, shortcut)
 
@@ -578,40 +570,30 @@ defmodule Bumblebee.Layers.Transformer do
 
     hidden_state =
       hidden_state
-      |> output_norm.()
-      |> ffn.()
+      |> steps.output_norm.()
+      |> steps.ffn.()
       |> Axon.add(shortcut)
 
     {hidden_state, attention_info, cross_attention_info}
   end
 
-  defp block_impl(
-         :parallel,
-         hidden_state,
-         self_attention_norm,
-         self_attention,
-         cross_attention_maybe,
-         _cross_attention_norm,
-         _cross_attention,
-         output_norm,
-         ffn
-       ) do
+  defp block_impl(:parallel, hidden_state, steps, _name) do
     shortcut = hidden_state
 
     {attention_hidden_state, attention_info} =
       hidden_state
-      |> self_attention_norm.()
-      |> self_attention.()
+      |> steps.self_attention_norm.()
+      |> steps.self_attention.()
 
     {_hidden_state, cross_attention_info} =
-      cross_attention_maybe.(hidden_state, fn _hidden_state ->
+      steps.cross_attention_maybe.(hidden_state, fn _hidden_state ->
         raise "cross attention not supported"
       end)
 
     ffn_hidden_state =
       hidden_state
-      |> output_norm.()
-      |> ffn.()
+      |> steps.output_norm.()
+      |> steps.ffn.()
 
     hidden_state = Axon.add([shortcut, attention_hidden_state, ffn_hidden_state])