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https://github.com/matrix-construct/construct
synced 2024-09-30 12:48:54 +02:00
ircd::gpt: Backpropagate adaptive moment estimations.
This commit is contained in:
Jason Volk
parent
da5fa1217a
commit
1f49f71530
1 changed files with 254 additions and 0 deletions
254
ircd/gpt.cc
254
ircd/gpt.cc
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@ -10,6 +10,16 @@
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namespace ircd::gpt
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{
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static size_t adamw(f32x4 &, f32x4 &, f32x4 &, const f32, const f32, const f32, const f32, const u32, size_t);
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static size_t adamw(task &, const f32, f32 *, const size_t, f32 *const (&)[2], const size_t);
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static size_t backprop(task &, const f32, model::norm &, f32 *const (&)[2], size_t);
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static size_t backprop(task &, const f32, model::attn &, f32 *const (&)[2], size_t);
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static size_t backprop(task &, const f32, model::ffnn &, f32 *const (&)[2], size_t);
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static size_t backprop(task &, const f32, model::block &, f32 *const (&)[2], size_t);
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static size_t backprop(task &, const f32, model::embed &, f32 *const (&)[2], size_t);
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static size_t backprop(task &, const f32, model::decoder &, f32 *const (&)[2], size_t = 0);
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template<class T>
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static void fmma(T *out, const T *in, const T *bias, const T *weight, const math::fmma_opts &);
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@ -141,6 +151,50 @@ ircd::gpt::generate(const vector_view<u16> &out,
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}
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uint64_t cycles(0);
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if(ctrl.prop)
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{
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static f32 *_momentum[2];
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if(!_momentum[0])
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{
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_momentum[0] = new f32[sizeof(model::decoder) / 4] {0.0f};
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_momentum[1] = new f32[sizeof(model::decoder) / 4] {0.0f};
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}
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f32 *const momentum[2]
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{
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_momentum[0], _momentum[1],
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};
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const prof::scope_cycles task_cycles
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{
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cycles
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};
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backprop(task, ctrl.loss_mean, *model::default_model, momentum);
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}
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if(ctrl.prop)
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{
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log::debug
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{
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log, "Backpropagation of %2.6f in %lu cycles.",
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ctrl.loss_mean,
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cycles,
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};
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ctrl.epoch = 0;
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ctrl.loss_mean = 0;
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ctrl.loss = ctrl.loss_mean;
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ctrl.perp_mean = 0;
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ctrl.perp = ctrl.perp_mean;
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ctrl.cert_mean = 0;
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ctrl.cert = ctrl.cert_mean;
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ctrl.prop = false;
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pipe::default_model->invalid = true;
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return {};
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}
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cycles = 0;
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milliseconds last_time {0};
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util::timer stopwatch;
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{
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@ -631,6 +685,206 @@ ircd::gpt::gelu(f32x4 &out,
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out = 0.5 * in * (1.0 + tanh(in * f32(0.7978845608) * (1.0 + f32(0.044715) * in * in)));
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}
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//
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// backside
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//
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size_t
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ircd::gpt::backprop(task &task,
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const f32 grad,
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model::decoder ¶m,
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f32 *const (&moment)[2],
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size_t off)
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{
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for(uint i(0); i < 12; ++i)
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off = backprop(task, grad, param.layer[i], moment, off);
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off = backprop(task, grad, param.f, moment, off);
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off = backprop(task, grad, param.word, moment, off);
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return off;
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}
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size_t
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ircd::gpt::backprop(task &task,
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const f32 grad,
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model::embed ¶m,
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f32 *const (&moment)[2],
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size_t off)
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{
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assert(task.opts);
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const auto &opts
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{
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*task.opts
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};
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for(uint i(0); i < opts.context_tokens; ++i)
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off = adamw(task, grad, param.pos[i], 768, moment, off);
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for(uint i(0); i < opts.logits; ++i)
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off = adamw(task, grad, param.token[i], 768, moment, off);
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return off;
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}
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size_t
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ircd::gpt::backprop(task &task,
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const f32 grad,
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model::block ¶m,
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f32 *const (&moment)[2],
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size_t off)
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{
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off = backprop(task, grad, param.ln1, moment, off);
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off = backprop(task, grad, param.attn, moment, off);
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off = backprop(task, grad, param.ln2, moment, off);
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off = backprop(task, grad, param.ffnn, moment, off);
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return off;
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}
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size_t
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ircd::gpt::backprop(task &task,
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const f32 grad,
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model::attn ¶m,
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f32 *const (&moment)[2],
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size_t off)
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{
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off = adamw(task, grad, param.attn_bias, 2304, moment, off);
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for(uint i(0); i < 768; ++i)
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off = adamw(task, grad, param.attn_weight[i], 2304, moment, off);
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off = adamw(task, grad, param.proj_bias, 768, moment, off);
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for(uint i(0); i < 768; ++i)
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off = adamw(task, grad, param.proj_weight[i], 768, moment, off);
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return off;
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}
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size_t
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ircd::gpt::backprop(task &task,
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const f32 grad,
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model::ffnn ¶m,
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f32 *const (&moment)[2],
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size_t off)
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{
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off = adamw(task, grad, param.fc_bias, 3072, moment, off);
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for(uint i(0); i < 768; ++i)
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off = adamw(task, grad, param.fc_weight[i], 3072, moment, off);
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off = adamw(task, grad, param.proj_bias, 768, moment, off);
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for(uint i(0); i < 3072; ++i)
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off = adamw(task, grad, param.proj_weight[i], 768, moment, off);
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return off;
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}
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size_t
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ircd::gpt::backprop(task &task,
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const f32 grad,
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model::norm ¶m,
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f32 *const (&moment)[2],
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size_t off)
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{
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off = adamw(task, grad, param.bias, 768, moment, off);
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off = adamw(task, grad, param.weight, 768, moment, off);
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return off;
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}
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size_t
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ircd::gpt::adamw(task &task,
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const f32 grad,
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f32 *const p_,
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const size_t num,
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f32 *const (&__restrict__ m_)[2],
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size_t off)
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{
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assert(task.opts);
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const auto &opts
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{
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*task.opts
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};
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assert(task.ctrl);
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auto &ctrl
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{
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*task.ctrl
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};
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f32x4 *const p[3]
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{
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reinterpret_cast<f32x4 *>(p_),
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reinterpret_cast<f32x4 *>(m_[0]) + off,
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reinterpret_cast<f32x4 *>(m_[1]) + off,
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};
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for(uint i(0); i < num / 4; ++i)
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off = adamw(p[0][i], p[1][i], p[2][i], grad, opts.alpha, opts.beta[0], opts.beta[1], ctrl.step, off);
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return off;
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}
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size_t
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ircd::gpt::adamw(f32x4 &__restrict__ param,
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f32x4 &__restrict__ moment0,
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f32x4 &__restrict__ moment1,
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const f32 grad,
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const f32 alpha,
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const f32 beta0,
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const f32 beta1,
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const u32 step,
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const size_t off)
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{
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const f32x4 one
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{
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1.0f, 1.0f, 1.0f, 1.0f,
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};
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const f32x4 a[2]
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{
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{ one - beta0 },
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{ one - beta1 },
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};
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const f32x4 avg_mul[2]
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{
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{ moment0 * beta0 },
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{ moment1 * beta1 },
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};
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const f32x4 avg_dot[2]
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{
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{ avg_mul[0] + a[0] * grad },
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{ avg_mul[1] + a[1] * grad * grad },
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};
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const f32x4 bias[2]
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{
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{ avg_dot[0] / (one - powf(beta0, step + 1)) },
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{ avg_dot[1] / (one - powf(beta1, step + 1)) },
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};
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const f32x4 denom
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{
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sqrtf(bias[1]) + 0.000001f // epsilon
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};
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const f32x4 delta
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{
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alpha * (bias[0] / denom)
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};
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const f32x4 update
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{
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param - delta
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};
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moment0 = avg_dot[0];
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moment1 = avg_dot[1];
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param = update;
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return off + 1;
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}
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//
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// gpt::task
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