Added gemma-7b performance

Author: Chillee

model.py

@@ -26,7 +26,7 @@ class ModelArgs:
     dim: int = 4096
     intermediate_size: int = None
     n_local_heads: int = -1
-    head_dim: int = 64
+    head_dim: int = None
     rope_base: float = 10000
     norm_eps: float = 1e-5
 
@@ -37,7 +37,8 @@ def __post_init__(self):
             hidden_dim = 4 * self.dim
             n_hidden = int(2 * hidden_dim / 3)
             self.intermediate_size = find_multiple(n_hidden, 256)
-        self.head_dim = self.dim // self.n_head
+        if self.head_dim is None:
+            self.head_dim = self.dim // self.n_head
 
     @classmethod
     def from_name(cls, name: str):
@@ -51,6 +52,7 @@ def from_name(cls, name: str):
 
 transformer_configs = {
     "gemma-2b": dict(dim=2048, vocab_size=256000, n_layer=18, n_head=8, n_local_heads=1, intermediate_size=16384),
+    "gemma-7b": dict(dim=3072, vocab_size=256000, n_layer=28, n_head=16, n_local_heads=16, intermediate_size=24576, head_dim=256),
     "CodeLlama-7b-Python-hf": dict(block_size=16384, vocab_size=32000, n_layer=32, dim = 4096, rope_base=1000000),
     "7B": dict(n_layer=32, n_head=32, dim=4096),
     "13B": dict(n_layer=40, n_head=40, dim=5120),
@@ -95,14 +97,13 @@ def __init__(self, config: ModelArgs) -> None:
     def setup_caches(self, max_batch_size, max_seq_length):
         if self.max_seq_length >= max_seq_length and self.max_batch_size >= max_batch_size:
             return
-        head_dim = self.config.dim // self.config.n_head
         max_seq_length = find_multiple(max_seq_length, 8)
         self.max_seq_length = max_seq_length
         self.max_batch_size = max_batch_size
         for b in self.layers:
-            b.attention.kv_cache = KVCache(max_batch_size, max_seq_length, self.config.n_local_heads, head_dim)
+            b.attention.kv_cache = KVCache(max_batch_size, max_seq_length, self.config.n_local_heads, self.config.head_dim)
 
-        self.freqs_cis = precompute_freqs_cis(self.config.block_size, self.config.dim // self.config.n_head, self.config.rope_base)
+        self.freqs_cis = precompute_freqs_cis(self.config.block_size, self.config.head_dim, self.config.rope_base)
         self.causal_mask = torch.tril(torch.ones(self.max_seq_length, self.max_seq_length, dtype=torch.bool))
 
     def forward(self, idx: Tensor, input_pos: Optional[Tensor] = None) -> Tensor:
@@ -145,7 +146,7 @@ def __init__(self, config: ModelArgs):
         total_head_dim = (config.n_head + 2 * config.n_local_heads) * config.head_dim
         # key, query, value projections for all heads, but in a batch
         self.wqkv = nn.Linear(config.dim, total_head_dim, bias=False)
-        self.wo = nn.Linear(config.dim, config.dim, bias=False)
+        self.wo = nn.Linear(config.n_head * config.head_dim, config.dim, bias=False)
         self.kv_cache = None
 
         self.n_head = config.n_head
@@ -165,7 +166,7 @@ def forward(self, x: Tensor, freqs_cis: Tensor, mask: Tensor, input_pos: Optiona
         bsz, seqlen, _ = x.shape
 
         kv_size = self.n_local_heads * self.head_dim
-        q, k, v = self.wqkv(x).split([self.dim, kv_size, kv_size], dim=-1)
+        q, k, v = self.wqkv(x).split([self.n_head * self.head_dim, kv_size, kv_size], dim=-1)
 
         q = q.view(bsz, seqlen, self.n_head, self.head_dim)
         k = k.view(bsz, seqlen, self.n_local_heads, self.head_dim)
@@ -183,7 +184,7 @@ def forward(self, x: Tensor, freqs_cis: Tensor, mask: Tensor, input_pos: Optiona
         v = v.repeat_interleave(self.n_head // self.n_local_heads, dim=1)
         y = F.scaled_dot_product_attention(q, k, v, attn_mask=mask, dropout_p=0.0)
 
-        y = y.transpose(1, 2).contiguous().view(bsz, seqlen, self.dim)
+        y = y.transpose(1, 2).contiguous().view(bsz, seqlen, self.n_head * self.head_dim)
 
         y = self.wo(y)
         return y
@@ -197,7 +198,7 @@ def __init__(self, config: ModelArgs) -> None:
         self.w2 = nn.Linear(config.intermediate_size, config.dim, bias=False)
 
     def forward(self, x: Tensor) -> Tensor:
-        return self.w2(F.gelu(self.w1(x)) * self.w3(x))
+        return self.w2(F.gelu(self.w1(x), approximate="tanh") * self.w3(x))
 
 
 class RMSNorm(nn.Module):