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llama.cpp
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added sigmoid backward pass

This commit is contained in:
Salvatore Rossitto 2026-03-17 09:07:21 +01:00
parent 01f9710cb2
commit a6979f3d56
1 changed files with 7 additions and 0 deletions
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7
ggml/src/ggml.c
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@ -6837,6 +6837,13 @@ static void ggml_compute_backward(
ggml_add_or_set(ctx, cgraph, isrc0, ggml_mul(ctx, grad, ggml_exp(ctx, src0)));
}
} break;
case GGML_UNARY_OP_SIGMOID: {
// d/dx sigmoid(x) = sigmoid(x) * (1 - sigmoid(x)) = tensor - tensor^2
if (src0_needs_grads) {
struct ggml_tensor * dsigmoid = ggml_sub(ctx, tensor, ggml_sqr(ctx, tensor));
ggml_add_or_set(ctx, cgraph, isrc0, ggml_mul(ctx, grad, dsigmoid));
}
} break;
case GGML_UNARY_OP_SOFTPLUS: {
if (src0_needs_grads) {
ggml_add_or_set(ctx, cgraph, isrc0, ggml_mul(ctx, grad, ggml_sigmoid(ctx, src0)));