llama: Add support for Gemma2ForCausalLM (#8156)

* Inference support for Gemma 2 model family * Update convert-hf-to-gguf.py, constants, and tensor mappings * cleanup * format fix * Fix special token vocab bug * Don't add space prefix * fix deleted lines * Update src/llama.cpp Co-authored-by: slaren <[email protected]> * Add model type names * Add control vector * Fix model type identification --------- Co-authored-by: Andrei Betlen <[email protected]> Co-authored-by: slaren <[email protected]>
ggerganov · Jun 28, 2024 · e57dc62 · e57dc62
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diff --git a/convert-hf-to-gguf.py b/convert-hf-to-gguf.py
@@ -2340,6 +2340,46 @@ def modify_tensors(self, data_torch: Tensor, name: str, bid: int | None) -> Iter
         return [(self.map_tensor_name(name), data_torch)]
 
 
+@Model.register("Gemma2ForCausalLM")
+class Gemma2Model(Model):
+    model_arch = gguf.MODEL_ARCH.GEMMA2
+
+    def set_vocab(self):
+        self._set_vocab_llama_hf()
+        self.gguf_writer.add_add_space_prefix(False)
+
+    def set_gguf_parameters(self):
+        hparams = self.hparams
+        block_count = hparams["num_hidden_layers"]
+
+        self.gguf_writer.add_name(self.dir_model.name if self.model_name is None else self.model_name)
+        self.gguf_writer.add_context_length(hparams["max_position_embeddings"])
+        self.gguf_writer.add_embedding_length(hparams["hidden_size"])
+        self.gguf_writer.add_block_count(block_count)
+        self.gguf_writer.add_feed_forward_length(hparams["intermediate_size"])
+        self.gguf_writer.add_head_count(hparams["num_attention_heads"])
+        self.gguf_writer.add_head_count_kv(self.hparams["num_key_value_heads"] if "num_key_value_heads" in hparams else hparams["num_attention_heads"])
+        self.gguf_writer.add_layer_norm_rms_eps(self.hparams["rms_norm_eps"])
+        self.gguf_writer.add_key_length(hparams["head_dim"])
+        self.gguf_writer.add_value_length(hparams["head_dim"])
+        self.gguf_writer.add_file_type(self.ftype)
+
+    def modify_tensors(self, data_torch: Tensor, name: str, bid: int | None) -> Iterable[tuple[str, Tensor]]:
+        del bid  # unusem
+
+        # lm_head is not used in llama.cpp, while autoawq will include this tensor in model
+        # To prevent errors, skip loading lm_head.weight.
+        if name == "lm_head.weight":
+            logger.debug(f"Skipping get tensor {name!r} in safetensors so that convert can end normally.")
+            return []
+
+        # ref: https://github.com/huggingface/transformers/blob/fc37f38915372c15992b540dfcbbe00a916d4fc6/src/transformers/models/gemma/modeling_gemma.py#L89
+        if name.endswith("norm.weight"):
+            data_torch = data_torch + 1
+
+        return [(self.map_tensor_name(name), data_torch)]
+
+
 @Model.register("Starcoder2ForCausalLM")
 class StarCoder2Model(Model):
     model_arch = gguf.MODEL_ARCH.STARCODER2

diff --git a/gguf-py/gguf/constants.py b/gguf-py/gguf/constants.py
@@ -150,6 +150,7 @@ class MODEL_ARCH(IntEnum):
     INTERNLM2    = auto()
     MINICPM      = auto()
     GEMMA        = auto()
+    GEMMA2       = auto()
     STARCODER2   = auto()
     MAMBA        = auto()
     XVERSE       = auto()
@@ -180,10 +181,13 @@ class MODEL_TENSOR(IntEnum):
     ATTN_NORM            = auto()
     ATTN_NORM_2          = auto()
     ATTN_OUT_NORM        = auto()
+    ATTN_POST_NORM       = auto()
     ATTN_ROT_EMBD        = auto()
     FFN_GATE_INP         = auto()
     FFN_GATE_INP_SHEXP   = auto()
     FFN_NORM             = auto()
+    FFN_PRE_NORM         = auto()
+    FFN_POST_NORM        = auto()
     FFN_GATE             = auto()
     FFN_DOWN             = auto()
     FFN_UP               = auto()
@@ -270,6 +274,7 @@ class MODEL_TENSOR(IntEnum):
     MODEL_ARCH.INTERNLM2:      "internlm2",
     MODEL_ARCH.MINICPM:        "minicpm",
     MODEL_ARCH.GEMMA:          "gemma",
+    MODEL_ARCH.GEMMA2:         "gemma2",
     MODEL_ARCH.STARCODER2:     "starcoder2",
     MODEL_ARCH.MAMBA:          "mamba",
     MODEL_ARCH.XVERSE:         "xverse",
@@ -303,9 +308,12 @@ class MODEL_TENSOR(IntEnum):
     MODEL_TENSOR.ATTN_Q_NORM:          "blk.{bid}.attn_q_norm",
     MODEL_TENSOR.ATTN_K_NORM:          "blk.{bid}.attn_k_norm",
     MODEL_TENSOR.ATTN_OUT_NORM:        "blk.{bid}.attn_output_norm",
+    MODEL_TENSOR.ATTN_POST_NORM:       "blk.{bid}.post_attention_norm",
     MODEL_TENSOR.FFN_GATE_INP:         "blk.{bid}.ffn_gate_inp",
     MODEL_TENSOR.FFN_GATE_INP_SHEXP:   "blk.{bid}.ffn_gate_inp_shexp",
     MODEL_TENSOR.FFN_NORM:             "blk.{bid}.ffn_norm",
+    MODEL_TENSOR.FFN_PRE_NORM:         "blk.{bid}.ffn_norm",
+    MODEL_TENSOR.FFN_POST_NORM:        "blk.{bid}.post_ffw_norm",
     MODEL_TENSOR.FFN_GATE:             "blk.{bid}.ffn_gate",
     MODEL_TENSOR.FFN_DOWN:             "blk.{bid}.ffn_down",
     MODEL_TENSOR.FFN_UP:               "blk.{bid}.ffn_up",
@@ -751,6 +759,21 @@ class MODEL_TENSOR(IntEnum):
         MODEL_TENSOR.FFN_UP,
         MODEL_TENSOR.FFN_NORM,
     ],
+    MODEL_ARCH.GEMMA2: [
+        MODEL_TENSOR.TOKEN_EMBD,
+        MODEL_TENSOR.OUTPUT_NORM,
+        MODEL_TENSOR.ATTN_Q,
+        MODEL_TENSOR.ATTN_K,
+        MODEL_TENSOR.ATTN_V,
+        MODEL_TENSOR.ATTN_OUT,
+        MODEL_TENSOR.FFN_GATE,
+        MODEL_TENSOR.FFN_DOWN,
+        MODEL_TENSOR.FFN_UP,
+        MODEL_TENSOR.ATTN_NORM,
+        MODEL_TENSOR.ATTN_POST_NORM,
+        MODEL_TENSOR.FFN_PRE_NORM,
+        MODEL_TENSOR.FFN_POST_NORM,
+    ],
     MODEL_ARCH.STARCODER2: [
         MODEL_TENSOR.TOKEN_EMBD,
         MODEL_TENSOR.OUTPUT_NORM,

diff --git a/gguf-py/gguf/tensor_mapping.py b/gguf-py/gguf/tensor_mapping.py
@@ -187,6 +187,10 @@ class TensorNameMap:
             "transformer.blocks.{bid}.norm_attn_norm.norm_2",  # dbrx
         ),
 
+        MODEL_TENSOR.ATTN_POST_NORM: (
+            "model.layers.{bid}.post_attention_layernorm",     # gemma2
+        ),
+
         # Rotary embeddings
         MODEL_TENSOR.ATTN_ROT_EMBD: (
             "model.layers.{bid}.self_attn.rotary_emb.inv_freq",        # llama-hf
@@ -210,6 +214,16 @@ class TensorNameMap:
             "transformer.decoder_layer.{bid}.rms_norm_2",                    # Grok
         ),
 
+        # Post feed-forward norm
+        MODEL_TENSOR.FFN_PRE_NORM: (
+            "model.layers.{bid}.pre_feedforward_layernorm", # gemma2
+        ),
+
+        # Post feed-forward norm
+        MODEL_TENSOR.FFN_POST_NORM: (
+            "model.layers.{bid}.post_feedforward_layernorm", # gemma2
+        ),
+
         MODEL_TENSOR.FFN_GATE_INP: (
             "layers.{bid}.feed_forward.gate",             # mixtral
             "model.layers.{bid}.block_sparse_moe.gate",   # mixtral