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Fix: safer and cleaner forward() in distributed embedding layer #834

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Fix: safer and cleaner forward() in distributed embedding layer #834

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25 changes: 16 additions & 9 deletions inference/model.py
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Original file line number Diff line number Diff line change
Expand Up @@ -115,16 +115,23 @@ def forward(self, x: torch.Tensor) -> torch.Tensor:
Raises:
ValueError: If `world_size` is not defined.
"""
if world_size > 1:
mask = (x < self.vocab_start_idx) | (x >= self.vocab_end_idx)
x = x - self.vocab_start_idx
x[mask] = 0
y = F.embedding(x, self.weight)
if world_size > 1:
y[mask] = 0
dist.all_reduce(y)
return y
def forward(self, x: torch.Tensor) -> torch.Tensor:
if self.world_size < 1:
raise ValueError("world_size must be >= 1")

if self.world_size == 1:
return F.embedding(x, self.weight)

# For world_size > 1
mask = (x < self.vocab_start_idx) | (x >= self.vocab_end_idx)
x = x - self.vocab_start_idx
x[mask] = 0

y = F.embedding(x, self.weight)
y[mask] = 0

dist.all_reduce(y)
return y

def linear(x: torch.Tensor, weight: torch.Tensor, bias: Optional[torch.Tensor] = None) -> torch.Tensor:
"""
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