332 lines
9.7 KiB
Plaintext
332 lines
9.7 KiB
Plaintext
package bot4cj.math
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import std.fs.*
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import std.io.*
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import std.convert.*
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//foreign func Sigmoid_do(m: CPointer<Unit>): CPointer<Unit>
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//foreign func Sigmoid_dot(m: CPointer<Unit>): CPointer<Unit>
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//foreign func ReLU_do(m: CPointer<Unit>): CPointer<Unit>
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//foreign func ReLU_dot(m: CPointer<Unit>): CPointer<Unit>
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//foreign func Leaky_ReLU_do(m: CPointer<Unit>, alpha: Float32): CPointer<Unit>
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//foreign func Leaky_ReLU_dot(m: CPointer<Unit>, alpha: Float32): CPointer<Unit>
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//foreign func Tanh_do(m: CPointer<Unit>): CPointer<Unit>
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//foreign func Tanh_dot(m: CPointer<Unit>): CPointer<Unit>
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/* -------- 新版的神经网络，使用原生矩阵对象实现 --------
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* TODO(20260517-qing): 增加batch批次处理，使用ArrayList<Matrix1>
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* TODO*(20260519-qing): 将神经网络转换为MatrixObject矩阵式对象
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* TODO(20260524-qing): 增加Adam优化器 */
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public class Nn1 {
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let inputno: Int64 /* -------- 输入 -------- */
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let outputno: Int64 /* -------- 输出 -------- */
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var weights: Matrix1 /* -- (inputs, outputs) - */
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var bias: Matrix1 /* ----- (1, output) ---- */
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let learning_rate: FP32 /* ------- 学习率 ------- */
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let f: Af /* ------ 激活函数 ------ */
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/*------------------*/
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var prev_inputs: Option<Matrix1> = None /* ---- 之前的输入 ---- */
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var prev_raw_inputs: Option<Matrix1> = None /* ---- 之前的原始输出 ---- */
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var prev_outputs: Option<Matrix1> = None /* ---- 之前的输出 ---- */
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/*------------------*/
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var weights_grad: Option<Matrix1> = None /* ---- 权重梯度 ---- */
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var bias_grad: Option<Matrix1> = None /* ---- 偏置梯度 ---- */
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/* -------- 初始化器 --------
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* TODO(20260516-qing): 不要把初始化方法写死，使用枚举类 */
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public init(i: Int64, o: Int64, lr: Float32, f: Af) {
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inputno = i
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outputno =o
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learning_rate=FP32(lr)
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this.f = f
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weights = Matrix1(inputno, outputno)
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bias = Matrix1(1, outputno)
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/* -------- 初始化权重 -------- */
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Ini.xavierUniformInit(weights, inputno, outputno)
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}
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/* -------- 神经网络推理 -------- */
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public func forward(x: Matrix1) {
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prev_inputs = x
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var r = x.dot(weights)
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r = r + bias
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prev_raw_inputs = r
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let r1 = f.forward(r)
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prev_outputs = r1
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return r1
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}
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/* -------- 反向传播算法 -------- */
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public func backward(errs: Matrix1)
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{
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if (is_softmax(f)) {
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return softmax_backward(errs)
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}
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let fbak = f.backward(prev_raw_inputs.getOrThrow())
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let first = errs * fbak /* 逐元素相乘 */
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let mx = prev_inputs.getOrThrow().T()
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weights_grad = mx.dot(first)
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bias_grad = first
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let errs_up = first.dot(weights.T())
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return errs_up
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}
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/* -------- 更新权重值、偏爱因子 --------
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* NOTE: discount（折扣）是为了方便深度强化学习给出奖励值 */
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public func update(discount: Float32) {
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weights = weights - weights_grad.getOrThrow() * learning_rate * FP32(discount)
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bias = bias - bias_grad.getOrThrow() * learning_rate * FP32(discount)
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}
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/**/
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private static func is_softmax(f: Af) {
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return match (f) {
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case Af.Softmax => true
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case _ => false
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}
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}
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private func softmax_backward(errs: Matrix1) {
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/* 使用雅可比矩阵的方式 */
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let y = prev_outputs.getOrThrow() /* softmax 输出 */
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let dy = errs /* 上游梯度 ∂L/∂y */
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let jacobian = f.backward(y) /* n×n 雅可比矩阵 */
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/* 将 dy 展平成列向量 n×1 */
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let row = dy.get_row()
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let col = dy.get_col()
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let n = row * col
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var dy_vec = Matrix1(n, 1)
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var idx = 0
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for (r in 0..row) {
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for (c in 0..col) {
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let val = dy.get(r, c).getOrThrow()
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dy_vec.set(idx, 0, val)
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idx = idx + 1
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}
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}
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/* dx_vec = J · dy_vec (n×n × n×1 = n×1) */
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var dx_vec = Matrix1(n, 1)
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for (i in 0..n) {
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var sum = 0.0f32
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for (j in 0..n) {
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let j_val = jacobian.get(i, j).getOrThrow().getValue()
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let dy_val = dy_vec.get(j, 0).getOrThrow().getValue()
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sum = sum + j_val * dy_val
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}
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dx_vec.set(i, 0, FP32(sum))
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}
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/* 恢复为原始形状，作为 first */
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var first = Matrix1(row, col)
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idx = 0
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for (r in 0..row) {
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for (c in 0..col) {
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let val = dx_vec.get(idx, 0).getOrThrow()
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first.set(r, c, val)
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idx = idx + 1
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}
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}
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let mx = prev_inputs.getOrThrow().T()
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weights_grad = mx.dot(first)
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bias_grad = first
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let errs_up = first.dot(weights.T())
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return errs_up
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}
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/* -------- 形状访问器 -------- */
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public func get_in_shape() {
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return inputno }
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public func get_out_shape() {
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return outputno }
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public func get_lr() {
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return learning_rate }
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public func get_f_type() {
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return f.get_type() }
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public func get_f_val() {
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return f.get_value() }
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/* ---------------------------- */
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}
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///* -------- 旧版激活函数 --------*/
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//public enum ActivationFuncs {
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// Sigmoid | ReLU | Leaky_ReLU | Tanh
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// func fdo(m: Matrix): Matrix { // 暂时只设置ReLU
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// unsafe {
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// match(this) {
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// case Sigmoid => Matrix(Sigmoid_do(m.getData()))
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// case ReLU => Matrix(ReLU_do(m.getData()))
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// case Leaky_ReLU => Matrix(Leaky_ReLU_do(m.getData(), 0.1f32))
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// case Tanh => Matrix(Tanh_do(m.getData()))
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// }
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// }
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// }
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// func fdot(m: Matrix): Matrix {
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// unsafe {
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// match(this) {
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// case Sigmoid => Matrix(Sigmoid_dot(m.getData()))
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// case ReLU => Matrix(ReLU_dot(m.getData()))
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// case Leaky_ReLU => Matrix(Leaky_ReLU_dot(m.getData(), 0.1f32))
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// case Tanh => Matrix(Tanh_dot(m.getData()))
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// }
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// }
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// }
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// func toString(): String {
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// match(this) {
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// case Sigmoid => "Sigmoid"
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// case ReLU => "ReLU"
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// case Leaky_ReLU => "Leaky_ReLU"
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// case Tanh => "Tanh"
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// }
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// }
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// static func parse(s: String) {
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// match(s) {
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// case "Sigmoid" => ActivationFuncs.Sigmoid
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// case "ReLU" => ActivationFuncs.ReLU
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// case "Leaky_ReLU" => ActivationFuncs.Leaky_ReLU
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// case "Tanh" => ActivationFuncs.Tanh
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// case _ => throw IllegalArgumentException()
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// }
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// }
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//}
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///* -------- 旧版的神经网络类 --------
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// * 这个实现依赖C++语言的动态分享库，特点是速度快
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// * 这个实现可能是有问题的 */
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//public class Nn {
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//
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// /* -------- 主初始化器 -------- */
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// public init(
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// inputno: UInt64, outputno: UInt64, f: ActivationFuncs, learning_rate: Float32) {
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// this.inputno = inputno
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// this.outputno = outputno
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// weights = Matrix.initWithXavierUniform(inputno, outputno)
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// bias = Matrix(1, outputno)
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// this.f = f
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// this.learning_rate = learning_rate
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// }
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//
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// /* -------- 提供了权重矩阵的初始化器 -------- */
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// public init(
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// inputno: UInt64, outputno: UInt64, f: ActivationFuncs, learning_rate: Float32, weights: Matrix, bias: Matrix) {
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// this.inputno = inputno
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// this.outputno = outputno
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// this.weights = weights
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// this.bias = bias
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// this.f = f
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// this.learning_rate = learning_rate
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// }
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//
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// /* -------- 神经网络推理 -------- */
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// func forward(x: Matrix): Matrix {
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// /* x => (1, inputs) */
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// let r = x.dot(weights) + bias /* (1, outputno) */
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// return r
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// }
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//
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// /* -------- 实施激活函数 -------- */
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// func fdo(x: Matrix): Matrix {
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// return f.fdo(x) }
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//
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// /* -------- 激活函数导数 -------- */
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// func fdot(x: Matrix): Matrix {
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// return f.fdot(x) }
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//
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// /* This is Wrong */
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// //func bak_bsgrad(prev_raw_outputs_dotf: Matrix, errs: Matrix): Matrix {
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// /* prev_raw_outputs_dotf => (1, outputno)
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// * errs => (1, outputno) */
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//
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// // return errs * prev_raw_outputs_dotf
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// //}
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//
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// /* -------- 权重梯度的传播 -------- */
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// func bak_wsgrad(prev_inputs: Matrix, delta: Matrix) {
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// /* prev_inputs => (1, inputs) */
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// return prev_inputs.T().dot(delta) /* (inputs, outputs) */
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// }
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//
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// /* -------- 计算上一层的误差 -------- */
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// func bak_uperrs(delta: Matrix, prev_dotf: Matrix) {
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// let first = weights.dot(delta.T()).T() // (1, inputs)
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//
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// var uperrs = first * prev_dotf
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// uperrs
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// }
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//
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// /* -------- 更新权重、偏爱因子 -------- */
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// func update(weights_grad: Matrix, bias_grad: Matrix, discount: Float32) {
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// weights -= weights_grad * learning_rate * discount
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// bias -= bias_grad * learning_rate * discount
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// }
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//
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// /* -------- 打印权重、偏爱因子 -------- */
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// func print() {
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// weights.print()
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// bias.print()
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// }
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//
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// /* -------- 打印神经网络全连接层的形状 -------- */
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// func print_shape() {
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// println("${inputno}, ${outputno}") }
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//
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// /* -------- 储存神经网络 -------- */
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// func save(file: File) {
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// file.write("FullConnectLayer ".toArray())
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// file.write(inputno.toString().toArray())
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// file.write(" ".toArray())
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// file.write(outputno.toString().toArray())
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// file.write(" ".toArray())
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// file.write(learning_rate.toString().toArray())
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// file.write(" ".toArray())
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// file.write(f.toString().toArray())
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// file.write("\n".toArray())
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// weights.save(file)
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// //file.write("\n".toArray())
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// bias.save(file)
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// //file.write("\n".toArray())
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// }
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//
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// /* -------- 静态方法，加载单个项目 -------- */
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// static func loadItem<T>(sr: StringReader<InputStream>) where T <: Parsable<T>
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// {
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// let s = sr.readUntil({r => r == r" " || r == r"\n"})
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// let ss = s.getOrThrow().trimAscii()
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// println(ss)
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// return T.parse(ss)
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// }
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//
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// /* -------- 静态方法，加载神经网络 -------- */
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// static func load(sr: StringReader<InputStream>)
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// {
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// let inputno = loadItem<UInt64>(sr)
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// let outputno = loadItem<UInt64>(sr)
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// let lr = loadItem<Float32>(sr)
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// let fna = sr.readUntil(r'\n')
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// let f = ActivationFuncs.parse(fna.getOrThrow().trimAscii())
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// let weights = Matrix.load(sr, inputno, outputno)
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// let bias = Matrix.load(sr, 1, outputno)
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// Nn(inputno, outputno, f, lr, weights, bias)
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// }
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//
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// let inputno: UInt64
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// let outputno: UInt64
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// var weights: Matrix /* (inputs, outputs) */
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// var bias: Matrix /* (1, outputs) */
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// var learning_rate: Float32
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// let f: ActivationFuncs
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//}
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