| 246 | """ |
| 247 | |
| 248 | def __init__( |
| 249 | self, |
| 250 | dim: int, |
| 251 | hidden_dim: int, |
| 252 | multiple_of: int, |
| 253 | ffn_dim_multiplier: Optional[float], |
| 254 | ): |
| 255 | super().__init__() |
| 256 | hidden_dim = int(2 * hidden_dim / 3) |
| 257 | # custom dim factor multiplier |
| 258 | if ffn_dim_multiplier is not None: |
| 259 | hidden_dim = int(ffn_dim_multiplier * hidden_dim) |
| 260 | hidden_dim = multiple_of * ((hidden_dim + multiple_of - 1) // multiple_of) |
| 261 | |
| 262 | self.w1 = nn.Linear(dim, hidden_dim, bias=False) |
| 263 | self.w2 = nn.Linear(hidden_dim, dim, bias=False) |
| 264 | self.w3 = nn.Linear(dim, hidden_dim, bias=False) |
| 265 | |
| 266 | def forward(self, x): |
| 267 | return self.w2(F.silu(self.w1(x)) * self.w3(x)) |