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Add no_grad to min gpt example #643

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Add no_grad to min gpt example #643

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e14777b
Update main.rs
Gadersd Mar 12, 2023
fbe48ab
Update main.rs
Gadersd Mar 14, 2023
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22 changes: 12 additions & 10 deletions examples/min-gpt/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -125,16 +125,18 @@ fn gpt(p: nn::Path, cfg: Config) -> impl ModuleT {

/// Generates some sample string using the GPT model.
fn sample(data: &TextData, gpt: &impl ModuleT, input: Tensor) -> String {
let mut input = input;
let mut result = String::new();
for _index in 0..SAMPLING_LEN {
let logits = input.apply_t(gpt, false).i((0, -1, ..));
let sampled_y = logits.softmax(-1, Kind::Float).multinomial(1, true);
let last_label = i64::from(&sampled_y);
result.push(data.label_to_char(last_label));
input = Tensor::cat(&[input, sampled_y.view([1, 1])], 1).narrow(1, 1, BLOCK_SIZE);
}
result
tch::no_grad(move || {
let mut input = input;
let mut result = String::new();
for _index in 0..SAMPLING_LEN {
let logits = input.apply_t(gpt, false).i((0, -1, ..));
let sampled_y = logits.softmax(-1, Kind::Float).multinomial(1, true);
let last_label = i64::from(&sampled_y);
result.push(data.label_to_char(last_label));
input = Tensor::cat(&[input, sampled_y.view([1, 1])], 1).narrow(1, 1, BLOCK_SIZE);
}
result
})
}

pub fn main() -> Result<()> {
Expand Down