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Use the gelu-erf activation. (#969)

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This commit is contained in:
Laurent Mazare
2023-09-26 22:30:21 +01:00
committed by GitHub
parent 4abc1ea34d
commit ce0a4e3a85
3 changed files with 5 additions and 9 deletions
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6
candle-core/src/quantized/utils.rs
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@ -17,7 +17,7 @@ pub(super) fn group_for_quantization<'a, 'b, T: super::k_quants::GgmlType>(
let expected_blocks = xs.len() / block_size;
let actual_blocks = ys.len();
//validate that the input is the right size
// Validate that the input is the right size
if expected_blocks != actual_blocks {
crate::bail!("quantize {dtype:?}: expected {expected_blocks} blocks but only {actual_blocks} were provided!")
}
@ -37,12 +37,12 @@ pub(super) fn group_for_dequantization<'a, 'b, T: super::k_quants::GgmlType>(
let actual_output_len = ys.len();
let expected_output_len = xs.len() * block_size;
//validate that the output is the right size
// Validate that the output is the right size
if expected_output_len != actual_output_len {
crate::bail!("dequantize {dtype:?}: ys (len = {actual_output_len}) does not match the expected length of {expected_output_len}!")
}
//zip the blocks and outputs together
// Zip the blocks and outputs together
Ok(xs.iter().zip(ys.chunks_exact_mut(block_size)).collect())
}

4
candle-nn/src/activation.rs
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@ -16,9 +16,7 @@ pub enum Activation {
impl super::Module for Activation {
fn forward(&self, xs: &Tensor) -> candle::Result<Tensor> {
match self {
Self::Gelu => xs.gelu(),
// TODO: This is "gelu_new", not the original "gelu".
// There's some small numerical difference:
Self::Gelu => xs.gelu_erf(),
// https://github.com/huggingface/transformers/blob/12f043eaeaabfef6f6efea411d98e6f6d3c094b7/src/transformers/activations.py#L49-L78
Self::NewGelu => xs.gelu(),
Self::Relu => xs.relu(),

4
candle-transformers/src/models/bert.rs
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@ -25,10 +25,8 @@ impl HiddenActLayer {
fn forward(&self, xs: &Tensor) -> candle::Result<Tensor> {
let _enter = self.span.enter();
match self.act {
// TODO: The all-MiniLM-L6-v2 model uses "gelu" whereas this is "gelu_new", this explains some
// small numerical difference.
// https://github.com/huggingface/transformers/blob/cd4584e3c809bb9e1392ccd3fe38b40daba5519a/src/transformers/activations.py#L213
HiddenAct::Gelu => xs.gelu(),
HiddenAct::Gelu => xs.gelu_erf(),
HiddenAct::Relu => xs.relu(),
}
}