feat: add support for Gemma (#1583)

integration-tests/conftest.py

@@ -40,6 +40,9 @@ class ResponseComparator(JSONSnapshotExtension):
         exclude=None,
         matcher=None,
     ):
+        if isinstance(data, Response):
+            data = data.dict()
+
         if isinstance(data, List):
             data = [d.dict() for d in data]
 

integration-tests/models/__snapshots__/test_flash_gemma/test_flash_gemma.json

+{
+  "details": {
+    "best_of_sequences": null,
+    "finish_reason": "length",
+    "generated_tokens": 10,
+    "prefill": [
+      {
+        "id": 2,
+        "logprob": null,
+        "text": "<bos>"
+      },
+      {
+        "id": 2015,
+        "logprob": -10.0,
+        "text": "Test"
+      },
+      {
+        "id": 3853,
+        "logprob": -10.875,
+        "text": " request"
+      }
+    ],
+    "seed": null,
+    "tokens": [
+      {
+        "id": 1736,
+        "logprob": -2.09375,
+        "special": false,
+        "text": " form"
+      },
+      {
+        "id": 109,
+        "logprob": -1.8671875,
+        "special": false,
+        "text": "\n\n"
+      },
+      {
+        "id": 651,
+        "logprob": -2.4375,
+        "special": false,
+        "text": "The"
+      },
+      {
+        "id": 2121,
+        "logprob": -1.8203125,
+        "special": false,
+        "text": " test"
+      },
+      {
+        "id": 3853,
+        "logprob": -0.23242188,
+        "special": false,
+        "text": " request"
+      },
+      {
+        "id": 1736,
+        "logprob": -0.08544922,
+        "special": false,
+        "text": " form"
+      },
+      {
+        "id": 603,
+        "logprob": -0.9375,
+        "special": false,
+        "text": " is"
+      },
+      {
+        "id": 1671,
+        "logprob": -1.671875,
+        "special": false,
+        "text": " used"
+      },
+      {
+        "id": 577,
+        "logprob": -0.40429688,
+        "special": false,
+        "text": " to"
+      },
+      {
+        "id": 3853,
+        "logprob": -1.1875,
+        "special": false,
+        "text": " request"
+      }
+    ],
+    "top_tokens": null
+  },
+  "generated_text": " form\n\nThe test request form is used to request"
+}

integration-tests/models/__snapshots__/test_flash_gemma/test_flash_gemma_all_params.json

+{
+  "details": {
+    "best_of_sequences": null,
+    "finish_reason": "length",
+    "generated_tokens": 10,
+    "prefill": [
+      {
+        "id": 2,
+        "logprob": null,
+        "text": "<bos>"
+      },
+      {
+        "id": 2015,
+        "logprob": -10.0,
+        "text": "Test"
+      },
+      {
+        "id": 3853,
+        "logprob": -10.875,
+        "text": " request"
+      }
+    ],
+    "seed": 0,
+    "tokens": [
+      {
+        "id": 7539,
+        "logprob": -0.73046875,
+        "special": false,
+        "text": " forms"
+      },
+      {
+        "id": 708,
+        "logprob": 0.0,
+        "special": false,
+        "text": " are"
+      },
+      {
+        "id": 671,
+        "logprob": -1.703125,
+        "special": false,
+        "text": " an"
+      },
+      {
+        "id": 8727,
+        "logprob": 0.0,
+        "special": false,
+        "text": " essential"
+      },
+      {
+        "id": 1702,
+        "logprob": 0.0,
+        "special": false,
+        "text": " part"
+      },
+      {
+        "id": 576,
+        "logprob": 0.0,
+        "special": false,
+        "text": " of"
+      },
+      {
+        "id": 573,
+        "logprob": 0.0,
+        "special": false,
+        "text": " the"
+      },
+      {
+        "id": 11859,
+        "logprob": -1.6953125,
+        "special": false,
+        "text": " lab"
+      },
+      {
+        "id": 2185,
+        "logprob": -1.3125,
+        "special": false,
+        "text": " process"
+      },
+      {
+        "id": 578,
+        "logprob": -1.5,
+        "special": false,
+        "text": " and"
+      }
+    ],
+    "top_tokens": null
+  },
+  "generated_text": "Test request forms are an essential part of the lab process and"
+}

integration-tests/models/__snapshots__/test_flash_gemma/test_flash_gemma_load.json

+[
+  {
+    "details": {
+      "best_of_sequences": null,
+      "finish_reason": "length",
+      "generated_tokens": 10,
+      "prefill": [
+        {
+          "id": 2,
+          "logprob": null,
+          "text": "<bos>"
+        },
+        {
+          "id": 2015,
+          "logprob": -10.0,
+          "text": "Test"
+        },
+        {
+          "id": 3853,
+          "logprob": -10.875,
+          "text": " request"
+        }
+      ],
+      "seed": null,
+      "tokens": [
+        {
+          "id": 1736,
+          "logprob": -2.09375,
+          "special": false,
+          "text": " form"
+        },
+        {
+          "id": 109,
+          "logprob": -1.9140625,
+          "special": false,
+          "text": "\n\n"
+        },
+        {
+          "id": 651,
+          "logprob": -2.453125,
+          "special": false,
+          "text": "The"
+        },
+        {
+          "id": 2121,
+          "logprob": -1.8984375,
+          "special": false,
+          "text": " test"
+        },
+        {
+          "id": 3853,
+          "logprob": -0.23535156,
+          "special": false,
+          "text": " request"
+        },
+        {
+          "id": 1736,
+          "logprob": -0.091308594,
+          "special": false,
+          "text": " form"
+        },
+        {
+          "id": 603,
+          "logprob": -0.96875,
+          "special": false,
+          "text": " is"
+        },
+        {
+          "id": 1671,
+          "logprob": -1.6484375,
+          "special": false,
+          "text": " used"
+        },
+        {
+          "id": 577,
+          "logprob": -0.43164062,
+          "special": false,
+          "text": " to"
+        },
+        {
+          "id": 3853,
+          "logprob": -1.2421875,
+          "special": false,
+          "text": " request"
+        }
+      ],
+      "top_tokens": null
+    },
+    "generated_text": " form\n\nThe test request form is used to request"
+  },
+  {
+    "details": {
+      "best_of_sequences": null,
+      "finish_reason": "length",
+      "generated_tokens": 10,
+      "prefill": [
+        {
+          "id": 2,
+          "logprob": null,
+          "text": "<bos>"
+        },
+        {
+          "id": 2015,
+          "logprob": -10.0,
+          "text": "Test"
+        },
+        {
+          "id": 3853,
+          "logprob": -10.875,
+          "text": " request"
+        }
+      ],
+      "seed": null,
+      "tokens": [
+        {
+          "id": 1736,
+          "logprob": -2.09375,
+          "special": false,
+          "text": " form"
+        },
+        {
+          "id": 109,
+          "logprob": -1.9140625,
+          "special": false,
+          "text": "\n\n"
+        },
+        {
+          "id": 651,
+          "logprob": -2.453125,
+          "special": false,
+          "text": "The"
+        },
+        {
+          "id": 2121,
+          "logprob": -1.8984375,
+          "special": false,
+          "text": " test"
+        },
+        {
+          "id": 3853,
+          "logprob": -0.23535156,
+          "special": false,
+          "text": " request"
+        },
+        {
+          "id": 1736,
+          "logprob": -0.091308594,
+          "special": false,
+          "text": " form"
+        },
+        {
+          "id": 603,
+          "logprob": -0.96875,
+          "special": false,
+          "text": " is"
+        },
+        {
+          "id": 1671,
+          "logprob": -1.6484375,
+          "special": false,
+          "text": " used"
+        },
+        {
+          "id": 577,
+          "logprob": -0.43164062,
+          "special": false,
+          "text": " to"
+        },
+        {
+          "id": 3853,
+          "logprob": -1.2421875,
+          "special": false,
+          "text": " request"
+        }
+      ],
+      "top_tokens": null
+    },
+    "generated_text": " form\n\nThe test request form is used to request"
+  },
+  {
+    "details": {
+      "best_of_sequences": null,
+      "finish_reason": "length",
+      "generated_tokens": 10,
+      "prefill": [
+        {
+          "id": 2,
+          "logprob": null,
+          "text": "<bos>"
+        },
+        {
+          "id": 2015,
+          "logprob": -10.0,
+          "text": "Test"
+        },
+        {
+          "id": 3853,
+          "logprob": -10.875,
+          "text": " request"
+        }
+      ],
+      "seed": null,
+      "tokens": [
+        {
+          "id": 1736,
+          "logprob": -2.09375,
+          "special": false,
+          "text": " form"
+        },
+        {
+          "id": 109,
+          "logprob": -1.9140625,
+          "special": false,
+          "text": "\n\n"
+        },
+        {
+          "id": 651,
+          "logprob": -2.453125,
+          "special": false,
+          "text": "The"
+        },
+        {
+          "id": 2121,
+          "logprob": -1.8984375,
+          "special": false,
+          "text": " test"
+        },
+        {
+          "id": 3853,
+          "logprob": -0.23535156,
+          "special": false,
+          "text": " request"
+        },
+        {
+          "id": 1736,
+          "logprob": -0.091308594,
+          "special": false,
+          "text": " form"
+        },
+        {
+          "id": 603,
+          "logprob": -0.96875,
+          "special": false,
+          "text": " is"
+        },
+        {
+          "id": 1671,
+          "logprob": -1.6484375,
+          "special": false,
+          "text": " used"
+        },
+        {
+          "id": 577,
+          "logprob": -0.43164062,
+          "special": false,
+          "text": " to"
+        },
+        {
+          "id": 3853,
+          "logprob": -1.2421875,
+          "special": false,
+          "text": " request"
+        }
+      ],
+      "top_tokens": null
+    },
+    "generated_text": " form\n\nThe test request form is used to request"
+  },
+  {
+    "details": {
+      "best_of_sequences": null,
+      "finish_reason": "length",
+      "generated_tokens": 10,
+      "prefill": [
+        {
+          "id": 2,
+          "logprob": null,
+          "text": "<bos>"
+        },
+        {
+          "id": 2015,
+          "logprob": -10.0,
+          "text": "Test"
+        },
+        {
+          "id": 3853,
+          "logprob": -10.875,
+          "text": " request"
+        }
+      ],
+      "seed": null,
+      "tokens": [
+        {
+          "id": 1736,
+          "logprob": -2.09375,
+          "special": false,
+          "text": " form"
+        },
+        {
+          "id": 109,
+          "logprob": -1.9140625,
+          "special": false,
+          "text": "\n\n"
+        },
+        {
+          "id": 651,
+          "logprob": -2.453125,
+          "special": false,
+          "text": "The"
+        },
+        {
+          "id": 2121,
+          "logprob": -1.8984375,
+          "special": false,
+          "text": " test"
+        },
+        {
+          "id": 3853,
+          "logprob": -0.23535156,
+          "special": false,
+          "text": " request"
+        },
+        {
+          "id": 1736,
+          "logprob": -0.091308594,
+          "special": false,
+          "text": " form"
+        },
+        {
+          "id": 603,
+          "logprob": -0.96875,
+          "special": false,
+          "text": " is"
+        },
+        {
+          "id": 1671,
+          "logprob": -1.6484375,
+          "special": false,
+          "text": " used"
+        },
+        {
+          "id": 577,
+          "logprob": -0.43164062,
+          "special": false,
+          "text": " to"
+        },
+        {
+          "id": 3853,
+          "logprob": -1.2421875,
+          "special": false,
+          "text": " request"
+        }
+      ],
+      "top_tokens": null
+    },
+    "generated_text": " form\n\nThe test request form is used to request"
+  }
+]

integration-tests/models/test_flash_gemma.py

+import pytest
+
+
+@pytest.fixture(scope="module")
+def flash_gemma_handle(launcher):
+    with launcher("gg-hf/gemma-2b", num_shard=1) as handle:
+        yield handle
+
+
+@pytest.fixture(scope="module")
+async def flash_gemma(flash_gemma_handle):
+    await flash_gemma_handle.health(300)
+    return flash_gemma_handle.client
+
+
+@pytest.mark.skip
+@pytest.mark.asyncio
+@pytest.mark.private
+async def test_flash_gemma(flash_gemma, response_snapshot):
+    response = await flash_gemma.generate(
+        "Test request", max_new_tokens=10, decoder_input_details=True
+    )
+
+    assert response.details.generated_tokens == 10
+    assert response == response_snapshot
+
+
+@pytest.mark.skip
+@pytest.mark.asyncio
+@pytest.mark.private
+async def test_flash_gemma_all_params(flash_gemma, response_snapshot):
+    response = await flash_gemma.generate(
+        "Test request",
+        max_new_tokens=10,
+        repetition_penalty=1.2,
+        return_full_text=True,
+        stop_sequences=["test"],
+        temperature=0.5,
+        top_p=0.9,
+        top_k=10,
+        truncate=5,
+        typical_p=0.9,
+        watermark=True,
+        decoder_input_details=True,
+        seed=0,
+    )
+
+    assert response.details.generated_tokens == 10
+    assert response == response_snapshot
+
+
+@pytest.mark.skip
+@pytest.mark.asyncio
+@pytest.mark.private
+async def test_flash_gemma_load(flash_gemma, generate_load, response_snapshot):
+    responses = await generate_load(flash_gemma, "Test request", max_new_tokens=10, n=4)
+
+    assert len(responses) == 4
+    assert all([r.generated_text == responses[0].generated_text for r in responses])
+
+    assert responses == response_snapshot

server/text_generation_server/models/__init__.py

@@ -52,6 +52,9 @@ try:
     from text_generation_server.models.flash_llama import (
         FlashLlama,
     )
+    from text_generation_server.models.flash_gemma import (
+        FlashGemma,
+    )
     from text_generation_server.models.flash_santacoder import (
         FlashSantacoderSharded,
     )
@@ -312,6 +315,28 @@ def get_model(
                 dtype=dtype,
                 trust_remote_code=trust_remote_code,
             )
+    if model_type == "gemma":
+        if FLASH_ATTENTION:
+            return FlashGemma(
+                model_id,
+                revision,
+                quantize=quantize,
+                dtype=dtype,
+                trust_remote_code=trust_remote_code,
+                use_medusa=use_medusa,
+            )
+        elif sharded:
+            raise NotImplementedError(
+                FLASH_ATT_ERROR_MESSAGE.format("Sharded Golden Gate")
+            )
+        else:
+            return CausalLM(
+                model_id,
+                revision,
+                quantize=quantize,
+                dtype=dtype,
+                trust_remote_code=trust_remote_code,
+            )
 
     if model_type in ["RefinedWeb", "RefinedWebModel", "falcon"]:
         if sharded:

server/text_generation_server/models/custom_modeling/flash_gemma_modeling.py

+# coding=utf-8
+# Copyright 2022 EleutherAI and the HuggingFace Inc. team. All rights reserved.
+#
+# This code is based on EleutherAI's GPT-NeoX library and the GPT-NeoX
+# and OPT implementations in this library. It has been modified from its
+# original forms to accommodate minor architectural differences compared
+# to GPT-NeoX and OPT used by the Meta AI team that trained the model.
+#
+# 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.
+
+import torch
+import torch.distributed
+import os
+from shutil import copyfile
+
+from torch import nn
+from transformers.activations import ACT2FN
+from transformers.configuration_utils import PretrainedConfig
+from typing import Optional, List, Tuple
+from tokenizers import processors
+from transformers.tokenization_utils_fast import PreTrainedTokenizerFast
+from transformers.utils import logging
+
+from text_generation_server.utils import paged_attention, flash_attn
+from text_generation_server.utils.layers import (
+    TensorParallelRowLinear,
+    TensorParallelColumnLinear,
+    TensorParallelEmbedding,
+    PositionRotaryEmbedding,
+    TensorParallelHead,
+    get_linear,
+    FastRMSNorm,
+)
+
+GemmaTokenizer = None
+
+logger = logging.get_logger(__name__)
+VOCAB_FILES_NAMES = {
+    "vocab_file": "tokenizer.model",
+    "tokenizer_file": "tokenizer.json",
+}
+
+PRETRAINED_VOCAB_FILES_MAP = {
+    "vocab_file": {
+        "hf-internal-testing/llama-tokenizer": "https://huggingface.co/hf-internal-testing/llama-tokenizer/resolve/main/tokenizer.model",
+    },
+    "tokenizer_file": {
+        "hf-internal-testing/llama-tokenizer": "https://huggingface.co/hf-internal-testing/llama-tokenizer/resolve/main/tokenizer_config.json",
+    },
+}
+B_INST, E_INST = "[INST]", "[/INST]"
+B_SYS, E_SYS = "<<SYS>>\n", "\n<</SYS>>\n\n"
+
+# fmt: off
+DEFAULT_SYSTEM_PROMPT = """You are a helpful, respectful and honest assistant. Always answer as helpfully as possible, while being safe. Your \
+answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure\
+ that your responses are socially unbiased and positive in nature.
+
+If a question does not make any sense, or is not factually coherent, explain why instead of answering something not \
+correct. If you don't know the answer to a question, please don't share false information."""
+# fmt: on
+
+
+class GemmaTokenizerFast(PreTrainedTokenizerFast):
+    vocab_files_names = VOCAB_FILES_NAMES
+    pretrained_vocab_files_map = PRETRAINED_VOCAB_FILES_MAP
+    slow_tokenizer_class = GemmaTokenizer
+    padding_side = "left"
+    model_input_names = ["input_ids", "attention_mask"]
+
+    def __init__(
+        self,
+        vocab_file=None,
+        tokenizer_file=None,
+        clean_up_tokenization_spaces=False,
+        unk_token="<unk>",
+        bos_token="<bos>",
+        eos_token="<eos>",
+        pad_token="<pad>",
+        add_bos_token=True,
+        add_eos_token=False,
+        use_default_system_prompt=False,
+        **kwargs,
+    ):
+        super().__init__(
+            vocab_file=vocab_file,
+            tokenizer_file=tokenizer_file,
+            clean_up_tokenization_spaces=clean_up_tokenization_spaces,
+            unk_token=unk_token,
+            bos_token=bos_token,
+            eos_token=eos_token,
+            pad_token=pad_token,
+            add_bos_token=add_bos_token,
+            add_eos_token=add_eos_token,
+            use_default_system_prompt=use_default_system_prompt,
+            **kwargs,
+        )
+        self._add_bos_token = add_bos_token
+        self._add_eos_token = add_eos_token
+        self.update_post_processor()
+        self.use_default_system_prompt = use_default_system_prompt
+        self.vocab_file = vocab_file
+
+    @property
+    def can_save_slow_tokenizer(self) -> bool:
+        return os.path.isfile(self.vocab_file) if self.vocab_file else False
+
+    def update_post_processor(self):
+        """
+        Updates the underlying post processor with the current `bos_token` and `eos_token`.
+        """
+        bos = self.bos_token
+        bos_token_id = self.bos_token_id
+        if bos is None and self.add_bos_token:
+            raise ValueError("add_bos_token = True but bos_token = None")
+
+        eos = self.eos_token
+        eos_token_id = self.eos_token_id
+        if eos is None and self.add_eos_token:
+            raise ValueError("add_eos_token = True but eos_token = None")
+
+        single = f"{(bos+':0 ') if self.add_bos_token else ''}$A:0{(' '+eos+':0') if self.add_eos_token else ''}"
+        pair = f"{single}{(' '+bos+':1') if self.add_bos_token else ''} $B:1{(' '+eos+':1') if self.add_eos_token else ''}"
+
+        special_tokens = []
+        if self.add_bos_token:
+            special_tokens.append((bos, bos_token_id))
+        if self.add_eos_token:
+            special_tokens.append((eos, eos_token_id))
+        self._tokenizer.post_processor = processors.TemplateProcessing(
+            single=single, pair=pair, special_tokens=special_tokens
+        )
+
+    @property
+    def add_eos_token(self):
+        return self._add_eos_token
+
+    @property
+    def add_bos_token(self):
+        return self._add_bos_token
+
+    @add_eos_token.setter
+    def add_eos_token(self, value):
+        self._add_eos_token = value
+        self.update_post_processor()
+
+    @add_bos_token.setter
+    def add_bos_token(self, value):
+        self._add_bos_token = value
+        self.update_post_processor()
+
+    def save_vocabulary(
+        self, save_directory: str, filename_prefix: Optional[str] = None
+    ) -> Tuple[str]:
+        if not self.can_save_slow_tokenizer:
+            raise ValueError(
+                "Your fast tokenizer does not have the necessary information to save the vocabulary for a slow "
+                "tokenizer."
+            )
+
+        if not os.path.isdir(save_directory):
+            logger.error(f"Vocabulary path ({save_directory}) should be a directory")
+            return
+        out_vocab_file = os.path.join(
+            save_directory,
+            (filename_prefix + "-" if filename_prefix else "")
+            + VOCAB_FILES_NAMES["vocab_file"],
+        )
+
+        if os.path.abspath(self.vocab_file) != os.path.abspath(out_vocab_file):
+            copyfile(self.vocab_file, out_vocab_file)
+
+        return (out_vocab_file,)
+
+    @property
+    def default_chat_template(self):
+        raise NotImplementedError
+
+    # TODO ArthurZ let's rely on the template processor instead, refactor all fast tokenizers
+    def build_inputs_with_special_tokens(self, token_ids_0, token_ids_1=None):
+        bos_token_id = [self.bos_token_id] if self.add_bos_token else []
+        eos_token_id = [self.eos_token_id] if self.add_eos_token else []
+
+        output = bos_token_id + token_ids_0 + eos_token_id
+
+        if token_ids_1 is not None:
+            output = output + bos_token_id + token_ids_1 + eos_token_id
+
+        return output
+
+
+class GemmaConfig(PretrainedConfig):
+    def __init__(
+        self,
+        vocab_size=256128,
+        hidden_size=3072,
+        intermediate_size=24576,
+        num_hidden_layers=28,
+        num_attention_heads=16,
+        num_key_value_heads=16,
+        head_dim=256,
+        hidden_act="gelu",
+        max_position_embeddings=8192,
+        initializer_range=0.02,
+        rms_norm_eps=1e-6,
+        use_cache=True,
+        pad_token_id=None,
+        bos_token_id=1,
+        eos_token_id=2,
+        tie_word_embeddings=True,
+        rope_theta=10000.0,
+        rope_scaling=None,
+        attention_bias=False,
+        attention_dropout=0.0,
+        **kwargs,
+    ):
+        self.vocab_size = vocab_size
+        self.max_position_embeddings = max_position_embeddings
+        self.hidden_size = hidden_size
+        self.head_dim = head_dim
+        self.intermediate_size = intermediate_size
+        self.num_hidden_layers = num_hidden_layers
+        self.num_attention_heads = num_attention_heads
+
+        # for backward compatibility
+        if num_key_value_heads is None:
+            num_key_value_heads = num_attention_heads
+
+        self.num_key_value_heads = num_key_value_heads
+        self.hidden_act = hidden_act
+        self.initializer_range = initializer_range
+        self.rms_norm_eps = rms_norm_eps
+        self.use_cache = use_cache
+        self.rope_theta = rope_theta
+        self.rope_scaling = rope_scaling
+        self.attention_bias = attention_bias
+        self.attention_dropout = attention_dropout
+
+        super().__init__(
+            pad_token_id=pad_token_id,
+            bos_token_id=bos_token_id,
+            eos_token_id=eos_token_id,
+            tie_word_embeddings=tie_word_embeddings,
+            **kwargs,
+        )
+
+
+class GemmaFastRMSNorm(FastRMSNorm):
+    @classmethod
+    def load(cls, prefix, weights, eps=1e-6):
+        weight = weights.get_tensor(f"{prefix}.weight") + 1
+        return cls(weight, eps)
+
+
+def load_attention(config, prefix, weights):
+    if config.num_attention_heads != config.num_key_value_heads:
+        return _load_gqa(config, prefix, weights)
+    else:
+        return TensorParallelColumnLinear.load_multi(
+            config,
+            prefixes=[f"{prefix}.q_proj", f"{prefix}.k_proj", f"{prefix}.v_proj"],
+            dim=0,
+            weights=weights,
+            bias=False,
+        )
+
+
+def _load_gqa(config, prefix: str, weights):
+    assert config.num_attention_heads % weights.process_group.size() == 0
+
+    weight = weights.get_multi_weights_col(
+        prefixes=[f"{prefix}.q_proj", f"{prefix}.k_proj", f"{prefix}.v_proj"],
+        quantize=config.quantize,
+        dim=0,
+    )
+
+    if config.quantize not in ["gptq", "awq"]:
+        weight = weight.to(dtype=weights.dtype).to(device=weights.device)
+
+        head_size = config.head_dim
+        num_heads = config.num_attention_heads // weights.process_group.size()
+        num_key_value_heads = config.num_key_value_heads // weights.process_group.size()
+        assert list(weight.shape) == [
+            (num_heads + 2 * num_key_value_heads) * head_size,
+            config.hidden_size,
+        ], f"{list(weight.shape)} != {[(num_heads + 2 * config.num_key_value_heads) * head_size, config.hidden_size]}"
+
+    return TensorParallelColumnLinear(
+        get_linear(weight, bias=None, quantize=config.quantize)
+    )
+
+
+class FlashGemmaAttention(torch.nn.Module):
+    def __init__(
+        self,
+        prefix: str,
+        config,
+        weights,
+    ):
+        super().__init__()
+        self.num_heads = config.num_attention_heads
+        self.head_size = config.head_dim
+
+        self.rotary_emb = PositionRotaryEmbedding.static(
+            config=config,
+            dim=self.head_size,
+            base=config.rope_theta,
+            device=weights.device,
+        )
+
+        self.softmax_scale = self.head_size**-0.5
+
+        if self.num_heads % weights.process_group.size() != 0:
+            raise ValueError(
+                f"`num_heads` must be divisible by `num_shards` (got `num_heads`: {self.num_heads} "
+                f"and `num_shards`: {weights.process_group.size()}"
+            )
+        self.num_heads = self.num_heads // weights.process_group.size()
+        self.num_key_value_heads = (
+            config.num_key_value_heads // weights.process_group.size()
+        )
+
+        self.query_key_value = load_attention(config, prefix, weights)
+
+        self.o_proj = TensorParallelRowLinear.load(
+            config,
+            prefix=f"{prefix}.o_proj",
+            weights=weights,
+            bias=False,
+        )
+        self.num_groups = self.num_heads // self.num_key_value_heads
+        self.kv_head_mapping = torch.arange(
+            0, self.num_key_value_heads, dtype=torch.int32, device=weights.device
+        ).repeat_interleave(self.num_groups)
+
+    def forward(
+        self,
+        hidden_states,
+        cos,
+        sin,
+        cu_seqlen_prefill,
+        kv_cache,
+        block_tables,
+        slots,
+        input_lengths,
+        max_s,
+    ):
+        qkv = self.query_key_value(hidden_states)
+        query, kv = qkv.split(
+            [
+                self.head_size * self.num_heads,
+                2 * self.head_size * self.num_key_value_heads,
+            ],
+            dim=1,
+        )
+        query = query.view(-1, self.num_heads, self.head_size)
+        kv = kv.view(-1, 2, self.num_key_value_heads, self.head_size)
+
+        self.rotary_emb(query, torch.select(kv, dim=1, index=0), cos, sin)
+
+        paged_attention.reshape_and_cache(
+            kv[:, 0], kv[:, 1], kv_cache[0], kv_cache[1], slots
+        )
+
+        # output tensor
+        attn_output = torch.empty_like(query)
+
+        # Prefill
+        if cu_seqlen_prefill is not None:
+            # flash attention
+            flash_attn.attention(
+                query,
+                torch.select(kv, dim=1, index=0),
+                torch.select(kv, dim=1, index=1),
+                attn_output,
+                cu_seqlen_prefill,
+                max_s,
+                self.softmax_scale,
+            )
+        # Decode
+        else:
+            paged_attention.attention(
+                attn_output,
+                query,
+                kv_cache[0],
+                kv_cache[1],
+                self.kv_head_mapping,
+                self.softmax_scale,
+                block_tables,
+                input_lengths,
+                max_s,
+            )
+
+        return self.o_proj(attn_output.view(-1, self.num_heads * self.head_size))
+
+
+class GemmaMLP(nn.Module):
+    def __init__(self, prefix, config, weights):
+        super().__init__()
+        act = config.hidden_act
+        self.act = (
+            ACT2FN[act]
+            if "gelu" not in act
+            else lambda x: torch.nn.functional.gelu(
+                x,
+                approximate=(
+                    "tanh" if act in ["gelu_fast", "gelu_pytorch_tanh"] else "none"
+                ),
+            )
+        )
+        # Fuse gate and up proj
+        self.gate_up_proj = TensorParallelColumnLinear.load_multi(
+            config,
+            prefixes=[f"{prefix}.gate_proj", f"{prefix}.up_proj"],
+            weights=weights,
+            dim=0,
+            bias=False,
+        )
+        self.down_proj = TensorParallelRowLinear.load(
+            config,
+            prefix=f"{prefix}.down_proj",
+            weights=weights,
+            bias=False,
+        )
+        self.intermediate_size = (
+            config.intermediate_size // weights.process_group.size()
+        )
+
+    def forward(self, hidden_states):
+        gate_up_states = self.gate_up_proj(hidden_states)
+        gate_up_states = gate_up_states.view(-1, 2, self.intermediate_size)
+        return self.down_proj(self.act(gate_up_states[:, 0]) * gate_up_states[:, 1])
+
+
+class FlashGemmaLayer(nn.Module):
+    def __init__(self, layer_id, config, weights):
+        super().__init__()
+        prefix = f"model.layers.{layer_id}"
+        self.self_attn = FlashGemmaAttention(
+            prefix=f"{prefix}.self_attn", config=config, weights=weights
+        )
+        self.mlp = GemmaMLP(prefix=f"{prefix}.mlp", config=config, weights=weights)
+
+        self.input_layernorm = GemmaFastRMSNorm.load(
+            prefix=f"{prefix}.input_layernorm", weights=weights, eps=config.rms_norm_eps
+        )
+        self.post_attention_layernorm = GemmaFastRMSNorm.load(
+            prefix=f"{prefix}.post_attention_layernorm",
+            weights=weights,
+            eps=config.rms_norm_eps,
+        )
+
+    def forward(
+        self,
+        hidden_states,
+        residual,
+        cos,
+        sin,
+        cu_seqlen_prefill,
+        kv_cache,
+        block_tables,
+        slots,
+        input_lengths,
+        max_s,
+    ):
+        normed_hidden_states, res = self.input_layernorm(hidden_states, residual)
+
+        # Self Attention
+        attn_output = self.self_attn(
+            normed_hidden_states,
+            cos,
+            sin,
+            cu_seqlen_prefill,
+            kv_cache,
+            block_tables,
+            slots,
+            input_lengths,
+            max_s,
+        )
+
+        # faster post attention rms norm
+        normed_attn_res_output, attn_res = self.post_attention_layernorm(
+            attn_output, res
+        )
+
+        mlp_output = self.mlp(normed_attn_res_output)
+
+        return mlp_output, attn_res
+
+
+class FlashGemmaModel(torch.nn.Module):
+    def __init__(self, config, weights):
+        super().__init__()
+
+        process_group = weights.process_group
+        self.tp_rank = process_group.rank()
+        self.tp_world_size = process_group.size()
+        embed_norm = config.hidden_size**0.5
+        self.embed_tokens = TensorParallelEmbedding(
+            prefix="model.embed_tokens", weights=weights
+        )
+        self.embed_tokens.weight *= embed_norm
+
+        self.layers = nn.ModuleList(
+            [
+                FlashGemmaLayer(
+                    layer_id,
+                    config,
+                    weights,
+                )
+                for layer_id in range(config.num_hidden_layers)
+            ]
+        )
+        self.norm = GemmaFastRMSNorm.load(
+            prefix="model.norm", weights=weights, eps=config.rms_norm_eps
+        )
+
+        self.gradient_checkpointing = False
+
+        self.head_size = self.layers[0].self_attn.head_size
+        self.num_heads = self.layers[0].self_attn.num_heads
+        self.num_key_value_heads = self.layers[0].self_attn.num_key_value_heads
+
+    def forward(
+        self,
+        input_ids: torch.Tensor,
+        position_ids: torch.Tensor,
+        cu_seqlen_prefill: Optional[torch.Tensor],
+        kv_cache: List[Tuple[torch.Tensor, torch.Tensor]],
+        block_tables: torch.Tensor,
+        slots: torch.Tensor,
+        input_lengths: torch.Tensor,
+        max_s: int,
+    ) -> torch.Tensor:
+        hidden_states = self.embed_tokens(input_ids)
+
+        # Get rotary cos and sin for this forward
+        # Avoid to index in each layer
+        cos, sin = self.layers[0].self_attn.rotary_emb.get_cos_sin(
+            position_ids, max_s, hidden_states.dtype
+        )
+
+        residual = None
+        for i, layer in enumerate(self.layers):
+            hidden_states, residual = layer(
+                hidden_states,
+                residual,
+                cos,
+                sin,
+                cu_seqlen_prefill,
+                kv_cache[i],
+                block_tables,
+                slots,
+                input_lengths,
+                max_s,
+            )
+
+        hidden_states, _ = self.norm(hidden_states, residual)
+
+        return hidden_states
+
+
+class FlashGemmaForCausalLM(torch.nn.Module):
+    def __init__(self, config, weights):
+        super().__init__()
+
+        self.model = FlashGemmaModel(config, weights)
+        self.lm_head = TensorParallelHead.load(
+            config,
+            prefix="model.embed_tokens" if config.tie_word_embeddings else "lm_head",
+            weights=weights,
+        )
+
+    def forward(
+        self,
+        input_ids: torch.Tensor,
+        position_ids: torch.Tensor,
+        cu_seqlen_prefill: Optional[torch.Tensor],
+        kv_cache: List[Tuple[torch.Tensor, torch.Tensor]],
+        block_tables: torch.Tensor,
+        slots: torch.Tensor,
+        input_lengths: torch.Tensor,
+        max_s: int,
+        lm_head_indices: Optional[torch.Tensor] = None,
+    ) -> torch.Tensor:
+        hidden_states = self.model(
+            input_ids,
+            position_ids,
+            cu_seqlen_prefill,
+            kv_cache,
+            block_tables,
+            slots,
+            input_lengths,
+            max_s,
+        )
+        if lm_head_indices is not None:
+            hidden_states = hidden_states[lm_head_indices]
+        logits = self.lm_head(hidden_states)
+        return logits

server/text_generation_server/models/flash_gemma.py

+import torch
+import torch.distributed
+
+from opentelemetry import trace
+from typing import Optional
+
+from text_generation_server.models import FlashCausalLM
+from text_generation_server.models.custom_modeling.flash_gemma_modeling import (
+    GemmaTokenizerFast,
+    FlashGemmaForCausalLM,
+    GemmaConfig,
+)
+from text_generation_server.utils import (
+    initialize_torch_distributed,
+    weight_files,
+    Weights,
+)
+
+tracer = trace.get_tracer(__name__)
+
+
+class FlashGemma(FlashCausalLM):
+    def __init__(
+        self,
+        model_id: str,
+        revision: Optional[str] = None,
+        quantize: Optional[str] = None,
+        dtype: Optional[torch.dtype] = None,
+        trust_remote_code: bool = False,
+        use_medusa: Optional[str] = None,
+    ):
+        self.process_group, rank, world_size = initialize_torch_distributed()
+        if torch.cuda.is_available():
+            device = torch.device(f"cuda:{rank}")
+            dtype = torch.bfloat16 if dtype is None else dtype
+        else:
+            raise NotImplementedError("FlashGemma is only available on GPU")
+
+        tokenizer = GemmaTokenizerFast.from_pretrained(
+            model_id,
+            revision=revision,
+            padding_side="left",
+            truncation_side="left",
+            trust_remote_code=trust_remote_code,
+            use_fast=True,
+            from_slow=False,
+        )
+
+        config = GemmaConfig.from_pretrained(
+            model_id, revision=revision, trust_remote_code=trust_remote_code
+        )
+        config.quantize = quantize
+
+        torch.distributed.barrier(group=self.process_group)
+
+        filenames = weight_files(model_id, revision=revision, extension=".safetensors")
+        weights = Weights(filenames, device, dtype, process_group=self.process_group)
+        if config.quantize in ["gptq", "awq"]:
+            weights._set_gptq_params(model_id, revision)
+
+        model = FlashGemmaForCausalLM(config, weights)
+        if use_medusa:
+            from text_generation_server.utils.medusa import MedusaModel
+            from huggingface_hub import hf_hub_download
+            import json
+            import os
+            from pathlib import Path
+
+            is_local_model = (
+                Path(use_medusa).exists() and Path(use_medusa).is_dir()
+            ) or os.getenv("WEIGHTS_CACHE_OVERRIDE", None) is not None
+
+            if not is_local_model:
+                medusa_config = hf_hub_download(
+                    use_medusa, revision=revision, filename="config.json"
+                )
+                medusa_head = hf_hub_download(
+                    use_medusa, revision=revision, filename="medusa_lm_head.pt"
+                )
+            else:
+                medusa_config = str(Path(use_medusa) / "config.json")
+                medusa_head = str(Path(use_medusa) / "medusa_lm_head.pt")
+
+            with open(medusa_config, "r") as f:
+                config = json.load(f)
+            medusa_sf = medusa_head[: -len(".pt")] + ".safetensors"
+            weights = Weights(
+                [medusa_sf], device, dtype, process_group=self.process_group
+            )
+            lm_head = model.lm_head
+            model.lm_head = MedusaModel(config, weights, lm_head)
+
+        torch.distributed.barrier(group=self.process_group)
+        super(FlashGemma, self).__init__(
+            model=model,
+            tokenizer=tokenizer,
+            num_layers=len(model.model.layers),
+            num_kv_heads=model.model.num_key_value_heads,
+            head_size=model.model.head_size,
+            dtype=dtype,
+            device=device,
+            rank=rank,
+            world_size=world_size,
+        )