Add CLIP text model (#643)

Ports the CLIP text model from Hugging Face. This is the first iteration
so not much is changed from the original model. Things like dropout and
checkpointing are removed.
Add numeric verification tests for the various components of the stack
when executing in eager mode. Verifications are made for float32 and
bfloat16. There are tests for toy-sized components and the whole model
as well as the Large pretrained variant.
These tests does not include testing with IREE.

Functionalities for mask creation are not yet ported.

.github/workflows/ci-sharktank.yml

@@ -122,9 +122,13 @@ jobs:
             iree-base-runtime
 
       - name: Run tests
+      # TODO: unify with-t5-data and with-clip-data flags into a single flag
+      # and make it possible to run only tests that require data.
         run: |
           pytest \
+          --with-clip-data \
             --with-t5-data \
+            sharktank/tests/models/clip/clip_test.py \
             sharktank/tests/models/t5/t5_test.py \
             --durations=0
 

sharktank/conftest.py

@@ -88,6 +88,15 @@ def pytest_addoption(parser):
         help="Enable all llama benchmarking tests",
     )
 
+    parser.addoption(
+        "--with-clip-data",
+        action="store_true",
+        default=False,
+        help=(
+            "Enable tests that use CLIP data like models that is not a part of the source "
+            "code. The user is expected to provide the data"
+        ),
+    )
     parser.addoption(
         "--with-t5-data",
         action="store_true",

sharktank/sharktank/layers/__init__.py

@@ -9,7 +9,7 @@
 from .kv_cache import BaseKVCache, DirectKVCache, PagedKVCache
 from .causal_llm import BaseCausalLMModel
 from .linear import LinearLayer
-from .norm import RMSNormLayer
+from .norm import RMSNormLayer, LayerNorm
 from .rotary_embedding import RotaryEmbeddingLayer
 from .token_embedding import TokenEmbeddingLayer
 from .llama_attention_block import LlamaAttentionBlock

sharktank/sharktank/layers/activations.py

@@ -0,0 +1,16 @@
+# Copyright 2024 Advanced Micro Devices, Inc.
+#
+# Licensed under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+from torch import nn
+from .. import ops
+
+# TODO: don't use nn.functional directly.
+ACT2FN = {
+    "gelu": nn.functional.gelu,
+    "gelu_new": ops.gelu_tanh_approximation,
+    "relu": nn.functional.relu,
+    "quick_gelu": ops.gelu_sigmoid_approximation,
+}

sharktank/sharktank/layers/configs/llm_configs.py

@@ -14,11 +14,11 @@
 (and indeed, can bootstrap these off of GGUF files).
 """
 
-from dataclasses import dataclass, field
+from dataclasses import asdict, dataclass, field
 from typing import Any, Optional
 import torch
 
-__all__ = ["LlamaHParams", "LlamaModelConfig", "T5Config"]
+__all__ = ["ClipTextConfig", "LlamaHParams", "LlamaModelConfig", "T5Config"]
 
 
 @dataclass
@@ -266,3 +266,49 @@ def from_gguf_properties(properties: dict[str, Any], **kwargs):
         all_kwargs.update(kwargs)
 
         return T5Config(**all_kwargs)
+
+
+@dataclass
+class ClipTextConfig:
+    vocab_size: int = 49408
+    hidden_size: int = 512
+    intermediate_size: int = 2048
+    projection_dim: int = 512
+    num_hidden_layers: int = 12
+    num_attention_heads: int = 8
+    max_position_embeddings: int = 77
+    hidden_act: str = "quick_gelu"
+    layer_norm_eps: float = 1e-5
+    # This differs from `CLIPTokenizer`'s default and from openai/clip
+    # See https://github.com/huggingface/transformers/pull/24773#issuecomment-1632287538
+    pad_token_id: int = 1
+    bos_token_id: int = 49406
+    eos_token_id: int = 49407
+    output_attentions: bool = False
+    output_hidden_states: bool = False
+    use_return_dict: bool = True
+
+    @staticmethod
+    def from_transformers_clip_text_config(
+        config: "transformers.CLIPTextConfig",
+    ) -> "ClipTextConfig":
+        return ClipTextConfig(
+            vocab_size=config.vocab_size,
+            hidden_size=config.hidden_size,
+            intermediate_size=config.intermediate_size,
+            projection_dim=config.projection_dim,
+            num_hidden_layers=config.num_hidden_layers,
+            num_attention_heads=config.num_attention_heads,
+            max_position_embeddings=config.max_position_embeddings,
+            hidden_act=config.hidden_act,
+            layer_norm_eps=config.layer_norm_eps,
+            pad_token_id=config.pad_token_id,
+            bos_token_id=config.bos_token_id,
+            eos_token_id=config.eos_token_id,
+            output_attentions=config.output_attentions,
+            output_hidden_states=config.output_hidden_states,
+            use_return_dict=config.use_return_dict,
+        )
+
+    def as_properties(self) -> dict[str, Any]:
+        return asdict(self)

sharktank/sharktank/layers/norm.py

@@ -39,3 +39,23 @@ def forward(self, x: torch.Tensor):
         # often in higher precision. Downcast back to expected.
         norm = ops.to(norm, orig_dtype)
         return norm
+
+
+class LayerNorm(ThetaLayer):
+    def __init__(
+        self,
+        theta: Theta,
+        *,
+        weight_name: str = "weight",
+        bias_name: str = "bias",
+        eps: float = 1e-05,
+    ):
+        super().__init__(theta)
+        self.weight = self.theta_tensor(weight_name)
+        self.bias = None
+        if bias_name in self.theta.keys:
+            self.bias = self.theta_tensor(bias_name)
+        self.eps = eps
+
+    def forward(self, x: torch.Tensor):
+        return ops.layer_norm(x, weight=self.weight, bias=self.bias, eps=self.eps)

sharktank/sharktank/models/clip/__init__.py

@@ -0,0 +1,8 @@
+# Copyright 2024 Advanced Micro Devices, Inc
+#
+# Licensed under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+from .clip import *
+from .export import *