[Model]Refactor MiniCPMV (vllm-project#7020)

Co-authored-by: Cyrus Leung <cyrus.tl.leung@gmail.com>

docs/source/models/supported_models.rst

@@ -220,7 +220,7 @@ Vision Language Models
     - Phi-3-Vision
     - :code:`microsoft/Phi-3-vision-128k-instruct`, etc.
     -
-  * - :code:`MiniCPM-V`
+  * - :code:`MiniCPMV`
     - MiniCPM-V
     - :code:`openbmb/MiniCPM-V-2` (see note), :code:`openbmb/MiniCPM-Llama3-V-2_5`, etc.
     -

vllm/model_executor/models/idefics2_vision_model.py

@@ -0,0 +1,296 @@
+# coding=utf-8
+
+# adapted from https://github.com/huggingface/transformers/blob/v4.43.2/src/transformers/models/idefics2/modeling_idefics2.py
+# Copyright 2024 The vLLM team.
+# Copyright 2024 the HuggingFace Inc. team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""PyTorch Idefics2 model."""
+
+from typing import Optional
+
+import torch
+from torch import nn
+from transformers.models.idefics2.configuration_idefics2 import (
+    Idefics2Config, Idefics2VisionConfig)
+from xformers import ops as xops
+
+from vllm.distributed import divide, get_tensor_model_parallel_world_size
+from vllm.model_executor.layers.activation import get_act_fn
+from vllm.model_executor.layers.linear import (ColumnParallelLinear,
+                                               QKVParallelLinear,
+                                               RowParallelLinear)
+from vllm.model_executor.layers.quantization import QuantizationConfig
+
+
+class Idefics2VisionEmbeddings(nn.Module):
+    """
+    This is a modified version of `siglip.modelign_siglip.SiglipVisionEmbeddings
+    ` to enable images of variable
+    resolution.
+
+    The modifications are adapted from [Patch n' Pack: NaViT, a Vision
+    Transformer for any Aspect Ratio and Resolution](https://arxiv.org/abs/2307.06304)
+    which allows treating images in their native aspect ratio and without the
+    need to resize them to the same fixed size. In particular, we start from the
+    original pre-trained SigLIP model(which uses images of fixed-size square
+    images) and adapt it by training on images of variable resolutions.
+    """
+
+    def __init__(self, config: Idefics2VisionConfig):
+        super().__init__()
+        self.embed_dim = config.hidden_size
+        self.image_size = config.image_size
+        self.patch_size = config.patch_size
+        self.patch_embedding = nn.Conv2d(
+            in_channels=config.num_channels,
+            out_channels=self.embed_dim,
+            kernel_size=self.patch_size,
+            stride=self.patch_size,
+            padding="valid",
+        )
+        self.num_patches_per_side = self.image_size // self.patch_size
+        self.num_patches = self.num_patches_per_side**2
+        self.num_positions = self.num_patches
+        self.position_embedding = nn.Embedding(self.num_positions,
+                                               self.embed_dim)
+
+    def forward(
+        self,
+        pixel_values: torch.FloatTensor,
+        patch_attention_mask: torch.BoolTensor,
+    ) -> torch.Tensor:
+        batch_size, _, max_im_h, max_im_w = pixel_values.shape
+        patch_embeds = self.patch_embedding(pixel_values)
+        embeddings = patch_embeds.flatten(2).transpose(1, 2)
+        max_nb_patches_h, max_nb_patches_w = (
+            max_im_h // self.patch_size,
+            max_im_w // self.patch_size,
+        )
+        boundaries = torch.arange(1 / self.num_patches_per_side, 1.0,
+                                  1 / self.num_patches_per_side)
+        position_ids = torch.full(size=(batch_size,
+                                        max_nb_patches_h * max_nb_patches_w),
+                                  fill_value=0)
+
+        for batch_idx, p_attn_mask in enumerate(patch_attention_mask):
+            nb_patches_h = p_attn_mask[:, 0].sum()
+            nb_patches_w = p_attn_mask[0].sum()
+            fractional_coords_h = torch.arange(0, 1 - 1e-6, 1 / nb_patches_h)
+            fractional_coords_w = torch.arange(0, 1 - 1e-6, 1 / nb_patches_w)
+            bucket_coords_h = torch.bucketize(fractional_coords_h,
+                                              boundaries,
+                                              right=True)
+            bucket_coords_w = torch.bucketize(fractional_coords_w,
+                                              boundaries,
+                                              right=True)
+            pos_ids = (bucket_coords_h[:, None] * self.num_patches_per_side +
+                       bucket_coords_w).flatten()
+            position_ids[batch_idx][p_attn_mask.view(-1).cpu()] = pos_ids
+        position_ids = position_ids.to(self.position_embedding.weight.device)
+        embeddings = embeddings + self.position_embedding(position_ids)
+        return embeddings
+
+
+class Idefics2VisionAttention(nn.Module):
+    """Multi-headed attention from 'Attention Is All You Need' paper"""
+
+    def __init__(
+        self,
+        config: Idefics2Config,
+        quant_config: Optional[QuantizationConfig] = None,
+    ):
+        super().__init__()
+        self.config = config
+        self.embed_dim = config.hidden_size
+        self.num_heads = config.num_attention_heads
+        self.head_dim = self.embed_dim // self.num_heads
+        if self.head_dim * self.num_heads != self.embed_dim:
+            raise ValueError(
+                f"embed_dim must be divisible by num_heads (got `embed_dim`: {self.embed_dim} and `num_heads`:"  # noqa: E501
+                f" {self.num_heads}).")
+        self.scale = self.head_dim**-0.5
+        self.dropout = config.attention_dropout
+        self.qkv_proj = QKVParallelLinear(
+            self.embed_dim,
+            self.head_dim,
+            self.num_heads,
+            quant_config=quant_config,
+        )
+        self.out_proj = RowParallelLinear(
+            self.embed_dim,
+            self.embed_dim,
+            bias=True,
+            quant_config=quant_config,
+        )
+        self.tp_size = get_tensor_model_parallel_world_size()
+        self.num_heads_per_partition = divide(self.num_heads, self.tp_size)
+        self.is_causal = False
+
+    def forward(
+        self,
+        hidden_states: torch.Tensor,
+    ) -> torch.Tensor:
+        batch_size, q_len, _ = hidden_states.size()
+        qkv, _ = self.qkv_proj(
+            hidden_states
+        )  # batch_size, q_len, 3 * num_heads_per_partition * head_dim
+        query_states, key_states, value_states = qkv.chunk(3, dim=-1)
+        query_states = query_states.view(batch_size, q_len,
+                                         self.num_heads_per_partition,
+                                         self.head_dim)
+        key_states = key_states.view(batch_size, q_len,
+                                     self.num_heads_per_partition,
+                                     self.head_dim)
+        value_states = value_states.view(batch_size, q_len,
+                                         self.num_heads_per_partition,
+                                         self.head_dim)
+        # see: https://facebookresearch.github.io/xformers/components/ops.html
+        out = xops.memory_efficient_attention_forward(
+            query_states,
+            key_states,
+            value_states,
+            p=self.dropout,
+            scale=self.scale,
+        )
+        out = out.view(batch_size, q_len, -1)
+        attn_output, _ = self.out_proj(out)
+        return attn_output
+
+
+class Idefics2VisionMLP(nn.Module):
+
+    def __init__(
+        self,
+        config: Idefics2Config,
+        quant_config: Optional[QuantizationConfig] = None,
+    ):
+        super().__init__()
+        self.config = config
+        self.activation_fn = get_act_fn(config.hidden_act)
+        self.fc1 = ColumnParallelLinear(
+            config.hidden_size,
+            config.intermediate_size,
+            bias=True,
+            quant_config=quant_config,
+        )
+        self.fc2 = RowParallelLinear(
+            config.intermediate_size,
+            config.hidden_size,
+            bias=True,
+            quant_config=quant_config,
+        )
+
+    def forward(self, hidden_states: torch.Tensor) -> torch.Tensor:
+        hidden_states, _ = self.fc1(hidden_states)
+        hidden_states = self.activation_fn(hidden_states)
+        hidden_states, _ = self.fc2(hidden_states)
+        return hidden_states
+
+
+class Idefics2EncoderLayer(nn.Module):
+
+    def __init__(self, config: Idefics2Config):
+        super().__init__()
+        self.embed_dim = config.hidden_size
+        self.self_attn = Idefics2VisionAttention(config)
+        self.layer_norm1 = nn.LayerNorm(self.embed_dim,
+                                        eps=config.layer_norm_eps)
+        self.mlp = Idefics2VisionMLP(config)
+        self.layer_norm2 = nn.LayerNorm(self.embed_dim,
+                                        eps=config.layer_norm_eps)
+
+    def forward(
+        self,
+        hidden_states: torch.Tensor,
+    ) -> torch.Tensor:
+        """
+        Args:
+            hidden_states (`torch.FloatTensor`):
+                Input to the layer of shape `(batch, seq_len, embed_dim)`.
+
+        """
+        residual = hidden_states
+        hidden_states = self.layer_norm1(hidden_states)
+        hidden_states = self.self_attn(hidden_states)
+        hidden_states = residual + hidden_states
+        residual = hidden_states
+        hidden_states = self.layer_norm2(hidden_states)
+        hidden_states = self.mlp(hidden_states)
+        hidden_states = residual + hidden_states
+        return hidden_states
+
+
+class Idefics2Encoder(nn.Module):
+    """
+    Transformer encoder consisting of `config.num_hidden_layers` self attention
+    layers. Each layer is a
+    [`Idefics2EncoderLayer`].
+
+    Args:
+        config: Idefics2Config
+    """
+
+    def __init__(self, config: Idefics2Config):
+        super().__init__()
+        self.config = config
+        self.layers = nn.ModuleList([
+            Idefics2EncoderLayer(config)
+            for _ in range(config.num_hidden_layers)
+        ])
+
+    def forward(
+        self,
+        inputs_embeds: torch.Tensor,
+    ) -> torch.Tensor:
+        r"""
+        Args:
+            inputs_embeds (torch.Tensor):
+                Optionally, instead of passing `input_ids` you can choose to
+                directly pass an embedded representation.
+                This is useful if you want more control over how to convert
+                `input_ids` indices into associated vectorsthan the model's
+                internal embedding lookup matrix.
+        """
+        hidden_states = inputs_embeds
+        for encoder_layer in self.layers:
+            layer_outputs = encoder_layer(hidden_states)
+            hidden_states = layer_outputs
+        return hidden_states
+
+
+class Idefics2VisionTransformer(nn.Module):
+
+    def __init__(self, config: Idefics2VisionConfig):
+        super().__init__()
+        embed_dim = config.hidden_size
+        self.config = config
+        self.embeddings = Idefics2VisionEmbeddings(config)
+        self.encoder = Idefics2Encoder(config)
+        self.post_layernorm = nn.LayerNorm(embed_dim,
+                                           eps=config.layer_norm_eps)
+
+    def get_input_embeddings(self):
+        return self.embeddings
+
+    def forward(
+        self,
+        pixel_values,
+        patch_attention_mask: Optional[torch.BoolTensor] = None,
+    ) -> torch.tensor:
+        hidden_states = self.embeddings(
+            pixel_values=pixel_values,
+            patch_attention_mask=patch_attention_mask)
+        encoder_outputs = self.encoder(hidden_states)
+        last_hidden_state = self.post_layernorm(encoder_outputs)
+        return last_hidden_state