diff --git a/lib/bumblebee.ex b/lib/bumblebee.ex index f44e9069..7935c4ee 100644 --- a/lib/bumblebee.ex +++ b/lib/bumblebee.ex @@ -186,6 +186,8 @@ defmodule Bumblebee do "RobertaForTokenClassification" => {Bumblebee.Text.Roberta, :for_token_classification}, "RobertaForCausalLM" => {Bumblebee.Text.Roberta, :for_causal_language_modeling}, "RobertaModel" => {Bumblebee.Text.Roberta, :base}, + "SwinModel" => {Bumblebee.Vision.Swin, :base}, + "SwinForImageClassification" => {Bumblebee.Vision.Swin, :for_image_classification}, "T5Model" => {Bumblebee.Text.T5, :base}, "T5ForConditionalGeneration" => {Bumblebee.Text.T5, :for_conditional_generation}, "T5EncoderModel" => {Bumblebee.Text.T5, :encoder}, diff --git a/lib/bumblebee/layers.ex b/lib/bumblebee/layers.ex index cde12666..e6a61794 100644 --- a/lib/bumblebee/layers.ex +++ b/lib/bumblebee/layers.ex @@ -200,7 +200,7 @@ defmodule Bumblebee.Layers do * `query` - `{batch_size, sequence_length, num_heads, head_size}` * `key` - `{batch_size, kv_sequence_length, num_heads, head_size}` * `value` - `{batch_size, kv_sequence_length, num_heads, head_size}` - * `key_mask` (optional) - `{batch_size, kv_sequence_length}` + * `key_mask` (optional) - `{batch_size, kv_sequence_length} | {batch_size, num_heads, sequence_length, kv_sequence_length}` * `head_mask` (optional) - `{num_heads}` * `bias` (optional) - `{batch_size | 1, num_heads | 1, sequence_length, kv_sequence_length}` * `offset` (optional) - `{}` @@ -273,8 +273,14 @@ defmodule Bumblebee.Layers do key_mask = case key_mask do - %Axon.None{} -> Nx.broadcast(1, {1, 1, 1, 1}) - key_mask -> key_mask |> Nx.new_axis(1) |> Nx.new_axis(1) + %Axon.None{} -> + Nx.broadcast(1, {1, 1, 1, 1}) + + key_mask -> + case Nx.rank(key_mask) do + 2 -> key_mask |> Nx.new_axis(1) |> Nx.new_axis(1) + 4 -> key_mask + end end query_sequence_length = Nx.axis_size(query, 2) diff --git a/lib/bumblebee/utils/nx.ex b/lib/bumblebee/utils/nx.ex index 51c6dadd..f9806af6 100644 --- a/lib/bumblebee/utils/nx.ex +++ b/lib/bumblebee/utils/nx.ex @@ -408,6 +408,82 @@ defmodule Bumblebee.Utils.Nx do Nx.take(tensor, flat_idx, axis: opts[:axis]) end + @doc """ + Shifts elements along the specified axes. + + When an shift is positive, the elements are shifted clockwise. + Negative shifts result in counter-clockwise shift. + + ## Options + + * `:shifts` - the shift size to apply to the corresponding axis + from `:axes` + + * `:axes` - the axes to apply shift to, must have the same length + as `:shifts` + + ## Examples + + iex> x = Nx.iota({3, 3}) + iex> Bumblebee.Utils.Nx.roll(x, shifts: [1], axes: [0]) + #Nx.Tensor< + s64[3][3] + [ + [6, 7, 8], + [0, 1, 2], + [3, 4, 5] + ] + > + + iex> x = Nx.iota({3, 3}) + iex> Bumblebee.Utils.Nx.roll(x, shifts: [-1], axes: [0]) + #Nx.Tensor< + s64[3][3] + [ + [3, 4, 5], + [6, 7, 8], + [0, 1, 2] + ] + > + + iex> x = Nx.iota({3, 3}) + iex> Bumblebee.Utils.Nx.roll(x, shifts: [1, 2], axes: [0, 1]) + #Nx.Tensor< + s64[3][3] + [ + [7, 8, 6], + [1, 2, 0], + [4, 5, 3] + ] + > + + """ + deftransform roll(tensor, opts) do + opts = Keyword.validate!(opts, shifts: [], axes: []) + + shifts = opts[:shifts] + axes = opts[:axes] + + if length(shifts) != length(axes) do + raise ArgumentError, + "expected shifts and axes to have the same number of elements," <> + " got shifts: #{inspect(shifts)}, axes: #{inspect(axes)}" + end + + shifts + |> Enum.zip(axes) + |> Enum.reduce(tensor, fn {shift, axis}, tensor -> + shift = rem(shift, Nx.axis_size(tensor, axis)) + + if shift == 0 do + tensor + else + {left, right} = Nx.split(tensor, -shift, axis: axis) + Nx.concatenate([right, left], axis: axis) + end + end) + end + @doc """ Returns size of the given `Nx.Batch`, including padding. """ diff --git a/lib/bumblebee/vision/swin.ex b/lib/bumblebee/vision/swin.ex new file mode 100644 index 00000000..42da43ca --- /dev/null +++ b/lib/bumblebee/vision/swin.ex @@ -0,0 +1,660 @@ +defmodule Bumblebee.Vision.Swin do + alias Bumblebee.Shared + + options = + [ + image_size: [ + default: 224, + doc: "the size of the input spatial dimensions" + ], + num_channels: [ + default: 3, + doc: "the number of channels in the input" + ], + patch_size: [ + default: 4, + doc: "the size of the patch spatial dimensions" + ], + embedding_size: [ + default: 96, + doc: "the dimensionality of patch embedding layer" + ], + use_absolute_position_embeddings: [ + default: false, + doc: "whether to add absolute position embeddings to the patch embeddings" + ], + num_blocks: [ + default: [2, 2, 6, 2], + doc: "the number of Transformer blocks in the encoder at each stage" + ], + num_attention_heads: [ + default: [3, 6, 12, 24], + doc: "the number of attention heads for each attention layer in the encoder at each stage" + ], + window_size: [ + default: 7, + doc: + "the window size, used to limit self-attention computation to non-overlapping windows" + ], + intermediate_size_ratio: [ + default: 4, + doc: """ + the dimensionality of the intermediate layer in the transformer feed-forward network (FFN) in the encoder, + expressed as a multiplier of hidden size (at the given stage) + """ + ], + use_attention_bias: [ + default: true, + doc: "whether to use bias in query, key, and value projections" + ], + activation: [ + default: :gelu, + doc: "the activation function" + ], + dropout_rate: [ + default: 0.0, + doc: "the dropout rate for encoder and decoder" + ], + attention_dropout_rate: [ + default: 0.0, + doc: "the dropout rate for attention weights" + ], + initializer_scale: [ + default: 0.02, + doc: + "the standard deviation of the normal initializer used for initializing kernel parameters" + ], + drop_path_rate: [ + default: 0.1, + doc: "the drop path rate used to for stochastic depth" + ], + layer_norm_epsilon: [ + default: 1.0e-5, + doc: "the epsilon used by the layer normalization layers" + ] + ] ++ Shared.common_options([:num_labels, :id_to_label]) + + @moduledoc """ + Swin Transformer model. + + ## Architectures + + * `:base` - plain Swin without any head on top + + * `:for_image_classification` - Swin tranformer model with a + classification head + + ## Global layer options + + #{Shared.global_layer_options_doc([:output_hidden_states, :output_attentions])} + + ## Configuration + + #{Shared.options_doc(options)} + + ## References + + * [Swin Transformer: Hierarchical Vision Transformer using Shifted Windows](https://arxiv.org/abs/2103.14030) + + """ + + defstruct [architecture: :base] ++ Shared.option_defaults(options) + + @behaviour Bumblebee.ModelSpec + @behaviour Bumblebee.Configurable + + import Bumblebee.Utils.Model, only: [join: 2] + import Nx.Defn + + alias Bumblebee.Layers + + @impl true + def architectures(), do: [:base, :for_image_classification] + + @impl true + def config(spec, opts) do + spec + |> Shared.put_config_attrs(opts) + |> Shared.validate_label_options() + end + + @impl true + def input_template(spec) do + %{ + "pixel_values" => + Nx.template({1, spec.image_size, spec.image_size, spec.num_channels}, :f32) + } + end + + @impl true + def model(%__MODULE__{architecture: :base} = spec) do + spec + |> inputs() + |> core(spec) + |> Layers.output() + end + + def model(%__MODULE__{architecture: :for_image_classification} = spec) do + inputs = inputs(spec) + outputs = core(inputs, spec) + + logits = + Axon.dense(outputs.pooled_state, spec.num_labels, + kernel_initializer: kernel_initializer(spec), + name: "image_classification_head.output" + ) + + Layers.output(%{ + logits: logits, + hidden_states: outputs.hidden_states, + attentions: outputs.attentions + }) + end + + defp inputs(spec) do + shape = {nil, spec.image_size, spec.image_size, spec.num_channels} + + Bumblebee.Utils.Model.inputs_to_map([ + Axon.input("pixel_values", shape: shape), + Axon.input("patch_mask", shape: {nil, nil}, optional: true) + ]) + end + + defp core(inputs, spec, opts \\ []) do + name = opts[:name] + + embeddings = + embedder(inputs["pixel_values"], inputs["patch_mask"], spec, name: join(name, "embedder")) + + encoder_outputs = + encoder(embeddings, spec, name: join(name, "encoder")) + + hidden_state = + Axon.layer_norm(encoder_outputs.hidden_state, + epsilon: spec.layer_norm_epsilon, + name: join(name, "norm") + ) + + pooled_state = + hidden_state + |> Axon.adaptive_avg_pool(output_size: {1}, name: join(name, "pooler")) + |> Axon.flatten() + + %{ + hidden_state: hidden_state, + pooled_state: pooled_state, + hidden_states: encoder_outputs.hidden_states, + attentions: encoder_outputs.attentions + } + end + + defp embedder(pixel_values, patch_mask, spec, opts) do + name = opts[:name] + + embeddings = + pixel_values + |> patch_embedding(spec, name: join(name, "patch_embedding")) + |> Layers.apply_vision_patch_mask(patch_mask, name: join(name, "mask_tokens")) + |> Axon.layer_norm(epsilon: spec.layer_norm_epsilon, name: join(name, "norm")) + + embeddings = + if spec.use_absolute_position_embeddings do + num_patches = div(spec.image_size, spec.patch_size) ** 2 + + position_embeddings = + Layers.learned_embeddings(num_patches, spec.embedding_size, + initializer: :zeros, + name: join(name, "position_embedding") + ) + + Axon.add(embeddings, position_embeddings) + else + embeddings + end + + embeddings + |> Axon.dropout(rate: spec.dropout_rate, name: join(name, "dropout")) + end + + defp patch_embedding(pixel_values, spec, opts) do + name = opts[:name] + hidden_size = spec.embedding_size + + pixel_values + |> Axon.conv(hidden_size, + kernel_size: spec.patch_size, + strides: spec.patch_size, + padding: :valid, + kernel_initializer: kernel_initializer(spec), + name: join(name, "projection") + ) + |> Axon.reshape({:batch, :auto, spec.embedding_size}, name: join(name, "reshape")) + end + + defp encoder(hidden_state, spec, opts) do + name = opts[:name] + + state = %{ + hidden_state: hidden_state, + hidden_states: Axon.container({hidden_state}), + attentions: Axon.container({}) + } + + for stage_idx <- 0..(length(spec.num_blocks) - 1), reduce: state do + state -> + name = name |> join("stages") |> join(stage_idx) + + grid_size = div(spec.image_size, spec.patch_size) + input_resolution = div(grid_size, 2 ** stage_idx) + + {hidden_state, attention, hidden_state_before_downsample} = + stage(state.hidden_state, spec, + hidden_size: spec.embedding_size * 2 ** stage_idx, + num_blocks: Enum.at(spec.num_blocks, stage_idx), + num_attention_heads: Enum.at(spec.num_attention_heads, stage_idx), + downsample: stage_idx < length(spec.num_blocks) - 1, + input_resolution: input_resolution, + name: name + ) + + %{ + hidden_state: hidden_state, + hidden_states: Layers.append(state.hidden_states, hidden_state_before_downsample), + attentions: Layers.append(state.attentions, attention) + } + end + end + + defp stage(hidden_state, spec, opts) do + name = opts[:name] + downsample = opts[:downsample] + hidden_size = opts[:hidden_size] + num_blocks = opts[:num_blocks] + num_attention_heads = opts[:num_attention_heads] + input_resolution = opts[:input_resolution] + + # Note that we include only record hidden_state and attention + # from the last block in each stage + + {hidden_state, attention} = + for block_idx <- 0..(num_blocks - 1), reduce: {hidden_state, nil} do + {hidden_state, _attention} -> + name = name |> join("blocks") |> join(block_idx) + + shift_size = + if rem(block_idx, 2) == 0 do + 0 + else + div(spec.window_size, 2) + end + + {hidden_state, attention} = + transformer_block(hidden_state, + num_attention_heads: num_attention_heads, + hidden_size: hidden_size, + kernel_initializer: kernel_initializer(spec), + dropout_rate: spec.dropout_rate, + attention_dropout_rate: spec.attention_dropout_rate, + layer_norm_epsilon: spec.layer_norm_epsilon, + intermediate_size: floor(spec.intermediate_size_ratio * hidden_size), + activation: spec.activation, + name: name, + window_size: spec.window_size, + shift_size: shift_size, + input_resolution: input_resolution + ) + + {hidden_state, attention} + end + + hidden_state_before_downsample = hidden_state + + hidden_state = + if downsample do + patch_merging(hidden_state, + input_resolution: input_resolution, + hidden_size: hidden_size, + layer_norm_epsilon: spec.layer_norm_epsilon, + kernel_initializer: kernel_initializer(spec), + name: join(name, "downsample") + ) + else + hidden_state + end + + {hidden_state, attention, hidden_state_before_downsample} + end + + defp transformer_block(hidden_state, opts) do + num_attention_heads = opts[:num_attention_heads] + hidden_size = opts[:hidden_size] + kernel_initializer = opts[:kernel_initializer] + dropout_rate = opts[:dropout_rate] + attention_dropout_rate = opts[:attention_dropout_rate] + layer_norm_epsilon = opts[:layer_norm_epsilon] + intermediate_size = opts[:intermediate_size] + activation = opts[:activation] + name = opts[:name] + window_size = opts[:window_size] + shift_size = opts[:shift_size] + input_resolution = opts[:input_resolution] + + {shift_size, window_size} = + if input_resolution <= window_size do + {0, input_resolution} + else + {shift_size, window_size} + end + + shortcut = hidden_state + + attention_mask = + window_attention_mask(hidden_state, shift_size, window_size, input_resolution) + + relative_attention_bias = + relative_attention_bias(window_size, num_attention_heads, + name: join(name, "self_attention.relative_attention_bias") + ) + + hidden_state = + hidden_state + |> Axon.layer_norm(epsilon: layer_norm_epsilon, name: join(name, "self_attention_norm")) + |> hidden_state_windows(shift_size, window_size, input_resolution) + + {hidden_state, attention, _self_attention_cache, _attention_relative_bias} = + Layers.Transformer.multi_head_attention(hidden_state, hidden_state, hidden_state, + attention_mask: attention_mask, + attention_relative_bias: relative_attention_bias, + num_heads: num_attention_heads, + hidden_size: hidden_size, + kernel_initializer: kernel_initializer, + dropout_rate: attention_dropout_rate, + name: join(name, "self_attention") + ) + + hidden_state = + Axon.dropout(hidden_state, rate: dropout_rate, name: join(name, "self_attention_dropout")) + + hidden_state = + hidden_state + |> reverse_hidden_state_windows(shift_size, window_size, input_resolution) + |> Axon.dropout(rate: dropout_rate) + + hidden_state = Axon.add(hidden_state, shortcut) + + shortcut = hidden_state + + hidden_state = + hidden_state + |> Axon.layer_norm(epsilon: layer_norm_epsilon, name: join(name, "output_norm")) + |> Axon.dense(intermediate_size, name: join(name, "ffn.intermediate")) + |> Layers.activation(activation) + |> Axon.dense(hidden_size, name: join(name, "ffn.output")) + |> Axon.dropout(rate: dropout_rate) + + hidden_state = Axon.add(hidden_state, shortcut) + + {hidden_state, attention} + end + + defp window_attention_mask(hidden_state, shift_size, window_size, input_resolution) do + if shift_size > 0 do + # Computes attention mask for shifted window multi-head self-attention (SW-MSA) + + Axon.nx(hidden_state, fn hidden_state -> + {batch_size, _dimension, _hidden_size} = Nx.shape(hidden_state) + height = width = input_resolution + + # See Figure 4. in the paper. We color the 2D patches (tokens) + # into 4 groups. Then, we compute a mask such that each token + # attends only to tokens within the same group. + + grid_0 = Nx.broadcast(0, {height - shift_size, width - shift_size}) + grid_b = Nx.broadcast(1, {height - shift_size, shift_size}) + grid_c = Nx.broadcast(2, {shift_size, width - shift_size}) + grid_a = Nx.broadcast(3, {shift_size, shift_size}) + + grid = + Nx.concatenate([ + Nx.concatenate([grid_0, grid_b], axis: 1), + Nx.concatenate([grid_c, grid_a], axis: 1) + ]) + + windowed_patch_groups = + grid + |> Nx.reshape({1, height, width, 1}) + |> window_partition(window_size) + |> Nx.reshape({:auto, window_size * window_size}) + + windows_attention_mask = + Nx.equal( + Nx.new_axis(windowed_patch_groups, 1), + Nx.new_axis(windowed_patch_groups, 2) + ) + |> Nx.new_axis(1) + + # Note that we repeat the mask for each batched input, so that + # the batch dimension has size batch_size * num_windows, which + # matches the input. This way we can apply the mask as usual, + # without reshaping back and forth. + Nx.tile(windows_attention_mask, [batch_size, 1, 1, 1]) + end) + else + Layers.none() + end + end + + defp relative_attention_bias(window_size, num_attention_heads, opts) do + name = opts[:name] + + kernel = + Axon.param("kernel", {(2 * window_size - 1) * (2 * window_size - 1), num_attention_heads}) + + Axon.layer( + fn kernel, opts -> + window_size = opts[:window_size] + + idx = relative_position_index(window_size) |> Nx.reshape({:auto}) + + kernel + |> Nx.take(idx) + |> Nx.reshape({window_size * window_size, window_size * window_size, :auto}) + |> Nx.transpose(axes: [2, 0, 1]) + |> Nx.new_axis(0) + end, + [kernel], + window_size: window_size, + name: name + ) + end + + defp relative_position_index(window_size) do + coords_h = Nx.iota({window_size, window_size}, axis: 0) |> Nx.flatten() + coords_w = Nx.iota({window_size, window_size}, axis: 1) |> Nx.flatten() + coord_pairs = Nx.stack([coords_h, coords_w]) + + relative_coords = Nx.subtract(Nx.new_axis(coord_pairs, 2), Nx.new_axis(coord_pairs, 1)) + + relative_coords + |> Nx.add(Nx.reshape(Nx.tensor([window_size - 1, window_size - 1]), {2, 1, 1})) + |> Nx.multiply(Nx.reshape(Nx.tensor([2 * window_size - 1, 1]), {2, 1, 1})) + |> Nx.sum(axes: [0]) + end + + defp hidden_state_windows(hidden_state, shift_size, window_size, input_resolution) do + Axon.nx(hidden_state, fn hidden_state -> + {batch_size, _dimension, hidden_size} = Nx.shape(hidden_state) + + height = width = input_resolution + hidden_state = Nx.reshape(hidden_state, {batch_size, height, width, hidden_size}) + + # Apply cyclic shift + hidden_state = + if shift_size > 0 do + Bumblebee.Utils.Nx.roll(hidden_state, shifts: [-shift_size, -shift_size], axes: [1, 2]) + else + hidden_state + end + + # Partition windows + hidden_state + |> window_partition(window_size) + |> Nx.reshape({:auto, window_size * window_size, hidden_size}) + end) + end + + defp reverse_hidden_state_windows(hidden_state, shift_size, window_size, input_resolution) do + Axon.nx(hidden_state, fn hidden_state -> + {_batch_size, _dimension, hidden_size} = Nx.shape(hidden_state) + height = width = input_resolution + + # Reverse window partitioning + hidden_state = + hidden_state + |> Nx.reshape({:auto, window_size, window_size, hidden_size}) + |> window_unpartition(window_size, height, width) + + # Reverse cyclic shift + hidden_state = + if shift_size > 0 do + Bumblebee.Utils.Nx.roll(hidden_state, shifts: [shift_size, shift_size], axes: [1, 2]) + else + hidden_state + end + + Nx.reshape(hidden_state, {:auto, height * width, hidden_size}) + end) + end + + defnp window_partition(tensor, window_size) do + {batch_size, height, width, hidden_size} = Nx.shape(tensor) + windowed_height = div(height, window_size) + windowed_width = div(width, window_size) + + Nx.reshape( + tensor, + {batch_size, windowed_height, window_size, windowed_width, window_size, hidden_size} + ) + |> Nx.transpose(axes: [0, 1, 3, 2, 4, 5]) + |> Nx.reshape({:auto, window_size, window_size, hidden_size}) + end + + defnp window_unpartition(tensor, window_size, height, width) do + {_batch_size, _height, _width, hidden_size} = Nx.shape(tensor) + windowed_height = div(height, window_size) + windowed_width = div(width, window_size) + + Nx.reshape( + tensor, + {:auto, windowed_height, windowed_width, window_size, window_size, hidden_size} + ) + |> Nx.transpose(axes: [0, 1, 3, 2, 4, 5]) + |> Nx.reshape({:auto, height, width, hidden_size}) + end + + defp patch_merging(hidden_state, opts) do + input_resolution = opts[:input_resolution] + hidden_size = opts[:hidden_size] + layer_norm_epsilon = opts[:layer_norm_epsilon] + kernel_initializer = opts[:kernel_initializer] + name = opts[:name] + + # We group patches from each 2x2 square and apply a dense layer + # against each group + + hidden_state + |> Axon.nx(fn hidden_state -> + {batch_size, _sequence_length, _hidden_size} = Nx.shape(hidden_state) + + hidden_state = + Nx.reshape(hidden_state, {batch_size, input_resolution, input_resolution, :auto}) + + input_feature_0 = hidden_state[[.., 0..-1//2, 0..-1//2, ..]] + input_feature_1 = hidden_state[[.., 1..-1//2, 0..-1//2, ..]] + input_feature_2 = hidden_state[[.., 0..-1//2, 1..-1//2, ..]] + input_feature_3 = hidden_state[[.., 1..-1//2, 1..-1//2, ..]] + + Nx.concatenate([input_feature_0, input_feature_1, input_feature_2, input_feature_3], + axis: -1 + ) + |> Nx.reshape({batch_size, :auto, 4 * hidden_size}) + end) + |> Axon.layer_norm(epsilon: layer_norm_epsilon, name: join(name, "norm")) + |> Axon.dense(2 * hidden_size, + kernel_initializer: kernel_initializer, + name: join(name, "reduction"), + use_bias: false + ) + end + + defp kernel_initializer(spec) do + Axon.Initializers.normal(scale: spec.initializer_scale) + end + + defimpl Bumblebee.HuggingFace.Transformers.Config do + def load(spec, data) do + import Shared.Converters + + opts = + convert!(data, + attention_dropout_rate: {"attention_probs_dropout_prob", number()}, + num_blocks: {"depths", list(number())}, + drop_path_rate: {"drop_path_rate", number()}, + embedding_size: {"embed_dim", number()}, + activation: {"hidden_act", activation()}, + dropout_rate: {"hidden_dropout_prob", number()}, + image_size: {"image_size", number()}, + initializer_scale: {"initializer_range", number()}, + layer_norm_epsilon: {"layer_norm_eps", number()}, + intermediate_size_ratio: {"mlp_ratio", number()}, + num_channels: {"num_channels", number()}, + num_attention_heads: {"num_heads", list(number())}, + patch_size: {"patch_size", number()}, + use_attention_bias: {"qkv_bias", boolean()}, + use_absolute_position_embeddings: {"use_absolute_embeddings", boolean()}, + window_size: {"window_size", number()} + ) ++ Shared.common_options_from_transformers(data, spec) + + @for.config(spec, opts) + end + end + + defimpl Bumblebee.HuggingFace.Transformers.Model do + def params_mapping(_spec) do + %{ + "embedder.patch_embedding.projection" => "swin.embeddings.patch_embeddings.projection", + "embedder.norm" => "swin.embeddings.norm", + "encoder.stages.{n}.blocks.{m}.output_norm" => + "swin.encoder.layers.{n}.blocks.{m}.layernorm_after", + "encoder.stages.{n}.blocks.{m}.self_attention_norm" => + "swin.encoder.layers.{n}.blocks.{m}.layernorm_before", + "encoder.stages.{n}.blocks.{m}.self_attention.key" => + "swin.encoder.layers.{n}.blocks.{m}.attention.self.key", + "encoder.stages.{n}.blocks.{m}.self_attention.output" => + "swin.encoder.layers.{n}.blocks.{m}.attention.output.dense", + "encoder.stages.{n}.blocks.{m}.self_attention.query" => + "swin.encoder.layers.{n}.blocks.{m}.attention.self.query", + "encoder.stages.{n}.blocks.{m}.self_attention.value" => + "swin.encoder.layers.{n}.blocks.{m}.attention.self.value", + "encoder.stages.{n}.blocks.{m}.self_attention.relative_attention_bias" => %{ + "kernel" => { + [ + {"swin.encoder.layers.{n}.blocks.{m}.attention.self", + "relative_position_bias_table"} + ], + fn [kernel] -> kernel end + } + }, + "encoder.stages.{n}.blocks.{m}.ffn.intermediate" => + "swin.encoder.layers.{n}.blocks.{m}.intermediate.dense", + "encoder.stages.{n}.blocks.{m}.ffn.output" => + "swin.encoder.layers.{n}.blocks.{m}.output.dense", + "encoder.stages.{n}.downsample.norm" => "swin.encoder.layers.{n}.downsample.norm", + "encoder.stages.{n}.downsample.reduction" => + "swin.encoder.layers.{n}.downsample.reduction", + "norm" => "swin.layernorm", + "image_classification_head.output" => "classifier" + } + end + end +end diff --git a/test/bumblebee/vision/swin_test.exs b/test/bumblebee/vision/swin_test.exs new file mode 100644 index 00000000..081e7401 --- /dev/null +++ b/test/bumblebee/vision/swin_test.exs @@ -0,0 +1,57 @@ +defmodule Bumblebee.Vision.SwinTest do + use ExUnit.Case, async: true + + import Bumblebee.TestHelpers + + @moduletag model_test_tags() + + test ":base" do + assert {:ok, %{model: model, params: params, spec: spec}} = + Bumblebee.load_model({:hf, "hf-internal-testing/tiny-random-SwinModel"}) + + assert %Bumblebee.Vision.Swin{architecture: :base} = spec + + inputs = %{ + "pixel_values" => Nx.broadcast(0.5, {1, 32, 32, 3}) + } + + outputs = Axon.predict(model, params, inputs) + + assert Nx.shape(outputs.hidden_state) == {1, 16, 64} + assert Nx.shape(outputs.pooled_state) == {1, 64} + + assert_all_close( + outputs.hidden_state[[.., 1..3, 1..3]], + Nx.tensor([ + [[-0.4605, 0.9336, -0.5528], [-0.4605, 0.9336, -0.5528], [-0.4605, 0.9336, -0.5528]] + ]) + ) + + assert_all_close( + outputs.pooled_state[[.., 1..3]], + Nx.tensor([[-0.4605, 0.9336, -0.5528]]) + ) + end + + test ":for_image_classification" do + assert {:ok, %{model: model, params: params, spec: spec}} = + Bumblebee.load_model( + {:hf, "hf-internal-testing/tiny-random-SwinForImageClassification"} + ) + + assert %Bumblebee.Vision.Swin{architecture: :for_image_classification} = spec + + inputs = %{ + "pixel_values" => Nx.broadcast(0.5, {1, 32, 32, 3}) + } + + outputs = Axon.predict(model, params, inputs) + + assert Nx.shape(outputs.logits) == {1, 2} + + assert_all_close( + outputs.logits, + Nx.tensor([[0.0361, 0.1352]]) + ) + end +end