neuralnetwork

package
v0.0.0-...-fcddba5 Latest Latest
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 Go to latest Published: Dec 19, 2023 License: MIT Imports: 18 Imported by: 0

Documentation

Overview

Package neuralnetwork reproduces multilayer perceptron based on Andreas Mueller implementation + float 32 implementation + weight decay + batch normalization

Index

Examples

Constants

This section is empty.

Variables

View Source 
var Activations32 = map[string]func(z blas32General){
	"identity": func(z blas32General) {},
	"logistic": func(z blas32General) {
		for row, zpos := 0, 0; row < z.Rows; row, zpos = row+1, zpos+z.Stride {
			for col := 0; col < z.Cols; col++ {
				z.Data[zpos+col] = 1 / (1 + M32.Exp(-z.Data[zpos+col]))
			}
		}
	},
	"tanh": func(z blas32General) {
		for row, zpos := 0, 0; row < z.Rows; row, zpos = row+1, zpos+z.Stride {
			for col := 0; col < z.Cols; col++ {
				z.Data[zpos+col] = M32.Tanh(-z.Data[zpos+col])
			}
		}
	},
	"relu": func(z blas32General) {
		for row, zpos := 0, 0; row < z.Rows; row, zpos = row+1, zpos+z.Stride {
			for col := 0; col < z.Cols; col++ {
				if z.Data[zpos+col] < 0 {
					z.Data[zpos+col] = 0
				}
			}
		}
	},
	"softmax": func(z blas32General) {
		for row, zpos := 0, 0; row < z.Rows; row, zpos = row+1, zpos+z.Stride {
			sum := float32(0)
			for col := 0; col < z.Cols; col++ {

				z.Data[zpos+col] = M32.Exp(z.Data[zpos+col])
				sum += z.Data[zpos+col]
			}
			for col := 0; col < z.Cols; col++ {
				z.Data[zpos+col] /= sum
			}
		}
	},
}

Activations32 is a map containing the inplace_activation functions

View Source 
var Activations64 = map[string]func(z blas64General){
	"identity": func(z blas64General) {},
	"logistic": func(z blas64General) {
		for row, zpos := 0, 0; row < z.Rows; row, zpos = row+1, zpos+z.Stride {
			for col := 0; col < z.Cols; col++ {
				z.Data[zpos+col] = 1 / (1 + M64.Exp(-z.Data[zpos+col]))
			}
		}
	},
	"tanh": func(z blas64General) {
		for row, zpos := 0, 0; row < z.Rows; row, zpos = row+1, zpos+z.Stride {
			for col := 0; col < z.Cols; col++ {
				z.Data[zpos+col] = M64.Tanh(-z.Data[zpos+col])
			}
		}
	},
	"relu": func(z blas64General) {
		for row, zpos := 0, 0; row < z.Rows; row, zpos = row+1, zpos+z.Stride {
			for col := 0; col < z.Cols; col++ {
				if z.Data[zpos+col] < 0 {
					z.Data[zpos+col] = 0
				}
			}
		}
	},
	"softmax": func(z blas64General) {
		for row, zpos := 0, 0; row < z.Rows; row, zpos = row+1, zpos+z.Stride {
			sum := float64(0)
			for col := 0; col < z.Cols; col++ {

				z.Data[zpos+col] = M64.Exp(z.Data[zpos+col])
				sum += z.Data[zpos+col]
			}
			for col := 0; col < z.Cols; col++ {
				z.Data[zpos+col] /= sum
			}
		}
	},
}

Activations64 is a map containing the inplace_activation functions

View Source 
var Derivatives32 = map[string]func(Z, deltas blas32General){
	"identity": func(Z, deltas blas32General) {
	},
	"logistic": func(Z, deltas blas32General) {
		for row, zpos, dpos := 0, 0, 0; row < Z.Rows; row, zpos, dpos = row+1, zpos+Z.Stride, dpos+deltas.Stride {
			for col := 0; col < Z.Cols; col++ {
				z := Z.Data[zpos+col]
				deltas.Data[dpos+col] *= z * (1 - z)
			}
		}
	},
	"tanh": func(Z, deltas blas32General) {
		for row, zpos, dpos := 0, 0, 0; row < Z.Rows; row, zpos, dpos = row+1, zpos+Z.Stride, dpos+deltas.Stride {
			for col := 0; col < Z.Cols; col++ {
				z := Z.Data[zpos+col]
				deltas.Data[dpos+col] *= 1 - z*z
			}
		}
	},
	"relu": func(Z, deltas blas32General) {
		for row, zpos, dpos := 0, 0, 0; row < Z.Rows; row, zpos, dpos = row+1, zpos+Z.Stride, dpos+deltas.Stride {
			for col := 0; col < Z.Cols; col++ {
				if Z.Data[zpos+col] == 0 {
					deltas.Data[dpos+col] = 0
				}
			}
		}
	},
}

Derivatives32 is a map of functions which multiply deltas with derivative of activation function

View Source 
var Derivatives64 = map[string]func(Z, deltas blas64General){
	"identity": func(Z, deltas blas64General) {
	},
	"logistic": func(Z, deltas blas64General) {
		for row, zpos, dpos := 0, 0, 0; row < Z.Rows; row, zpos, dpos = row+1, zpos+Z.Stride, dpos+deltas.Stride {
			for col := 0; col < Z.Cols; col++ {
				z := Z.Data[zpos+col]
				deltas.Data[dpos+col] *= z * (1 - z)
			}
		}
	},
	"tanh": func(Z, deltas blas64General) {
		for row, zpos, dpos := 0, 0, 0; row < Z.Rows; row, zpos, dpos = row+1, zpos+Z.Stride, dpos+deltas.Stride {
			for col := 0; col < Z.Cols; col++ {
				z := Z.Data[zpos+col]
				deltas.Data[dpos+col] *= 1 - z*z
			}
		}
	},
	"relu": func(Z, deltas blas64General) {
		for row, zpos, dpos := 0, 0, 0; row < Z.Rows; row, zpos, dpos = row+1, zpos+Z.Stride, dpos+deltas.Stride {
			for col := 0; col < Z.Cols; col++ {
				if Z.Data[zpos+col] == 0 {
					deltas.Data[dpos+col] = 0
				}
			}
		}
	},
}

Derivatives64 is a map of functions which multiply deltas with derivative of activation function

View Source 
var LossFunctions32 = map[string]func(y, h blas32General) float32{
	"square_loss": func(y, h blas32General) float32 {
		sum := float32(0)
		for row, hpos, ypos := 0, 0, 0; row < y.Rows; row, hpos, ypos = row+1, hpos+h.Stride, ypos+y.Stride {
			for col := 0; col < y.Cols; col++ {
				e := h.Data[hpos+col] - y.Data[ypos+col]
				sum += e * e
			}
		}
		return sum / 2 / float32(h.Rows)
	},
	"log_loss": func(y, h blas32General) float32 {
		sum := float32(0)
		hmin, hmax := M32.Nextafter(0, 1), M32.Nextafter(1, 0)
		for row, hpos, ypos := 0, 0, 0; row < y.Rows; row, hpos, ypos = row+1, hpos+h.Stride, ypos+y.Stride {
			for col := 0; col < y.Cols; col++ {
				hval := h.Data[hpos+col]
				if hval < hmin {
					hval = hmin
				} else if hval > hmax {
					hval = hmax
				}
				if y.Data[ypos+col] != 0 {
					sum += -y.Data[ypos+col] * M32.Log(hval)
				}
			}
		}
		return sum / float32(h.Rows)
	},
	"binary_log_loss": func(y, h blas32General) float32 {
		sum := float32(0)
		hmin, hmax := M32.Nextafter(0, 1), M32.Nextafter(1, 0)
		for row, hpos, ypos := 0, 0, 0; row < y.Rows; row, hpos, ypos = row+1, hpos+h.Stride, ypos+y.Stride {
			for col := 0; col < y.Cols; col++ {
				hval := h.Data[hpos+col]
				if hval < hmin {
					hval = hmin
				} else if hval > hmax {
					hval = hmax
				}
				sum += -y.Data[ypos+col]*M32.Log(hval) - (1-y.Data[ypos+col])*M32.Log1p(-hval)
			}
		}
		return sum / float32(h.Rows)
	},
}

LossFunctions32 is a map for loss functions

View Source 
var LossFunctions64 = map[string]func(y, h blas64General) float64{
	"square_loss": func(y, h blas64General) float64 {
		sum := float64(0)
		for row, hpos, ypos := 0, 0, 0; row < y.Rows; row, hpos, ypos = row+1, hpos+h.Stride, ypos+y.Stride {
			for col := 0; col < y.Cols; col++ {
				e := h.Data[hpos+col] - y.Data[ypos+col]
				sum += e * e
			}
		}
		return sum / 2 / float64(h.Rows)
	},
	"log_loss": func(y, h blas64General) float64 {
		sum := float64(0)
		hmin, hmax := M64.Nextafter(0, 1), M64.Nextafter(1, 0)
		for row, hpos, ypos := 0, 0, 0; row < y.Rows; row, hpos, ypos = row+1, hpos+h.Stride, ypos+y.Stride {
			for col := 0; col < y.Cols; col++ {
				hval := h.Data[hpos+col]
				if hval < hmin {
					hval = hmin
				} else if hval > hmax {
					hval = hmax
				}
				if y.Data[ypos+col] != 0 {
					sum += -y.Data[ypos+col] * M64.Log(hval)
				}
			}
		}
		return sum / float64(h.Rows)
	},
	"binary_log_loss": func(y, h blas64General) float64 {
		sum := float64(0)
		hmin, hmax := M64.Nextafter(0, 1), M64.Nextafter(1, 0)
		for row, hpos, ypos := 0, 0, 0; row < y.Rows; row, hpos, ypos = row+1, hpos+h.Stride, ypos+y.Stride {
			for col := 0; col < y.Cols; col++ {
				hval := h.Data[hpos+col]
				if hval < hmin {
					hval = hmin
				} else if hval > hmax {
					hval = hmax
				}
				sum += -y.Data[ypos+col]*M64.Log(hval) - (1-y.Data[ypos+col])*M64.Log1p(-hval)
			}
		}
		return sum / float64(h.Rows)
	},
}

LossFunctions64 is a map for loss functions

View Source 
var M32 = struct {
	Ceil       func(float32) float32
	Sqrt       func(float32) float32
	Pow        func(float32, float32) float32
	IsInf      func(float32, int) bool
	Abs        func(float32) float32
	Exp        func(float32) float32
	Tanh       func(float32) float32
	Log        func(float32) float32
	Log1p      func(float32) float32
	MaxFloat32 float32
	Inf        func(int) float32
	IsNaN      func(float32) bool
	Nextafter  func(x, y float32) float32
	MaxFloatXX floatXX
}{
	Ceil: m32.Ceil, Sqrt: m32.Sqrt, Pow: m32.Pow, IsInf: m32.IsInf, Abs: m32.Abs, Exp: m32.Exp, Tanh: m32.Tanh, Log: m32.Log, Log1p: m32.Log1p,
	MaxFloat32: m32.MaxFloat32, Inf: m32.Inf, IsNaN: m32.IsNaN, Nextafter: m32.Nextafter, MaxFloatXX: m32.MaxFloat32}

M32 has funcs for float32 math

View Source 
var M64 = struct {
	Ceil       func(float64) float64
	Sqrt       func(float64) float64
	Pow        func(float64, float64) float64
	IsInf      func(float64, int) bool
	Abs        func(float64) float64
	Exp        func(float64) float64
	Tanh       func(float64) float64
	Log        func(float64) float64
	Log1p      func(float64) float64
	MaxFloat64 float64
	Inf        func(int) float64
	IsNaN      func(float64) bool
	Nextafter  func(x, y float64) float64
}{Ceil: m64.Ceil, Sqrt: m64.Sqrt, Pow: m64.Pow, IsInf: m64.IsInf, Abs: m64.Abs, Exp: m64.Exp, Tanh: m64.Tanh, Log: m64.Log, Log1p: m64.Log1p,
	MaxFloat64: m64.MaxFloat64, Inf: m64.Inf, IsNaN: m64.IsNaN, Nextafter: m64.Nextafter}

M64 has funcs for float64 math

View Source 
var MXX = M32

MXX has funcs for floatXX math

View Source 
var MaxIdxXX = MaxIdx32

MaxIdxXX ...

View Source 
var Regressors = []base.Predicter{&MLPRegressor{}}

Regressors is the list of regressors in this package

Functions

func MaxIdx32 

func MaxIdx32(a []float32) int

MaxIdx32 ...

func MaxIdx64 

func MaxIdx64(a []float64) int

MaxIdx64 ...

Types

type AdamOptimizer32 

type AdamOptimizer32 struct {
	Params                []float32
	LearningRateInit      float32
	LearningRate          float32
	Beta1, Beta2, Epsilon float32
	// contains filtered or unexported fields
}

AdamOptimizer32 is the stochastic adam optimizer

type AdamOptimizer64 

type AdamOptimizer64 struct {
	Params                []float64
	LearningRateInit      float64
	LearningRate          float64
	Beta1, Beta2, Epsilon float64
	// contains filtered or unexported fields
}

AdamOptimizer64 is the stochastic adam optimizer

type BaseMultilayerPerceptron32 

type BaseMultilayerPerceptron32 struct {
	Activation         string  `json:"activation"`
	Solver             string  `json:"solver"`
	Alpha              float32 `json:"alpha"`
	WeightDecay        float32 `json:"weight_decay"`
	BatchSize          int     `json:"batch_size"`
	BatchNormalize     bool
	LearningRate       string           `json:"learning_rate"`
	LearningRateInit   float32          `json:"learning_rate_init"`
	PowerT             float32          `json:"power_t"`
	MaxIter            int              `json:"max_iter"`
	LossFuncName       string           `json:"loss_func_name"`
	HiddenLayerSizes   []int            `json:"hidden_layer_sizes"`
	Shuffle            bool             `json:"shuffle"`
	RandomState        base.RandomState `json:"random_state"`
	Tol                float32          `json:"tol"`
	Verbose            bool             `json:"verbose"`
	WarmStart          bool             `json:"warm_start"`
	Momentum           float32          `json:"momentum"`
	NesterovsMomentum  bool             `json:"nesterovs_momentum"`
	EarlyStopping      bool             `json:"early_stopping"`
	ValidationFraction float32          `json:"validation_fraction"`
	Beta1              float32          `json:"beta_1"`
	Beta2              float32          `json:"beta_2"`
	Epsilon            float32          `json:"epsilon"`
	NIterNoChange      int              `json:"n_iter_no_change"`

	// Outputs
	NLayers       int
	NIter         int
	NOutputs      int
	Intercepts    [][]float32     `json:"intercepts_"`
	Coefs         []blas32General `json:"coefs_"`
	OutActivation string          `json:"out_activation_"`
	Loss          float32

	LossCurve           []float32
	ValidationScores    []float32
	BestValidationScore float32
	BestLoss            float32
	NoImprovementCount  int
	// contains filtered or unexported fields
}

BaseMultilayerPerceptron32 closely matches sklearn/neural_network/multilayer_perceptron.py

func NewBaseMultilayerPerceptron32 

func NewBaseMultilayerPerceptron32() *BaseMultilayerPerceptron32

NewBaseMultilayerPerceptron32 returns a BaseMultilayerPerceptron32 with defaults

func (*BaseMultilayerPerceptron32) Fit 

func (mlp *BaseMultilayerPerceptron32) Fit(X, Y Matrix)

Fit compute Coefs and Intercepts

Example (Mnist) 
X, Y := datasets.LoadMnist()
mlp := NewBaseMultilayerPerceptron32()
mlp.HiddenLayerSizes = []int{25}
mlp.MaxIter = 200
mlp.RandomState = base.NewLockedSource(7)
mlp.Shuffle = true
mlp.BatchNormalize = true
expectedMinAccuracy := .988

if testing.Short() {
	mlp.MaxIter = 20
	expectedMinAccuracy = .93
}
mlp.Fit(X, Y)
accuracy := mlp.Score(X, Y)
if accuracy < expectedMinAccuracy {
	fmt.Println("accuracy", accuracy)
} else {
	fmt.Println("ok")
}

Output:

ok

func (*BaseMultilayerPerceptron32) GetNOutputs 

func (mlp *BaseMultilayerPerceptron32) GetNOutputs() int

GetNOutputs returns output columns number for Y to pass to predict

func (*BaseMultilayerPerceptron32) IsClassifier 

func (mlp *BaseMultilayerPerceptron32) IsClassifier() bool

IsClassifier return true if LossFuncName is not square_loss

func (*BaseMultilayerPerceptron32) Predict 

func (mlp *BaseMultilayerPerceptron32) Predict(X mat.Matrix, Y Mutable)

Predict do forward pass and fills Y (Y must be Mutable)

func (*BaseMultilayerPerceptron32) Score 

func (mlp *BaseMultilayerPerceptron32) Score(Xmatrix, Ymatrix mat.Matrix) float64

Score for BaseMultiLayerPerceptron32 is R2Score or Accuracy depending on LossFuncName

func (*BaseMultilayerPerceptron32) SetParams 

func (mlp *BaseMultilayerPerceptron32) SetParams(params map[string]interface{})

SetParams allow settings params from a map. (used by Unmarshal)

func (*BaseMultilayerPerceptron32) Unmarshal 

func (mlp *BaseMultilayerPerceptron32) Unmarshal(buf []byte) error

Unmarshal init params intercepts_ coefs_ from json

type BaseMultilayerPerceptron64 

type BaseMultilayerPerceptron64 struct {
	Activation         string  `json:"activation"`
	Solver             string  `json:"solver"`
	Alpha              float64 `json:"alpha"`
	WeightDecay        float64 `json:"weight_decay"`
	BatchSize          int     `json:"batch_size"`
	BatchNormalize     bool
	LearningRate       string           `json:"learning_rate"`
	LearningRateInit   float64          `json:"learning_rate_init"`
	PowerT             float64          `json:"power_t"`
	MaxIter            int              `json:"max_iter"`
	LossFuncName       string           `json:"loss_func_name"`
	HiddenLayerSizes   []int            `json:"hidden_layer_sizes"`
	Shuffle            bool             `json:"shuffle"`
	RandomState        base.RandomState `json:"random_state"`
	Tol                float64          `json:"tol"`
	Verbose            bool             `json:"verbose"`
	WarmStart          bool             `json:"warm_start"`
	Momentum           float64          `json:"momentum"`
	NesterovsMomentum  bool             `json:"nesterovs_momentum"`
	EarlyStopping      bool             `json:"early_stopping"`
	ValidationFraction float64          `json:"validation_fraction"`
	Beta1              float64          `json:"beta_1"`
	Beta2              float64          `json:"beta_2"`
	Epsilon            float64          `json:"epsilon"`
	NIterNoChange      int              `json:"n_iter_no_change"`

	// Outputs
	NLayers       int
	NIter         int
	NOutputs      int
	Intercepts    [][]float64     `json:"intercepts_"`
	Coefs         []blas64General `json:"coefs_"`
	OutActivation string          `json:"out_activation_"`
	Loss          float64

	LossCurve           []float64
	ValidationScores    []float64
	BestValidationScore float64
	BestLoss            float64
	NoImprovementCount  int
	// contains filtered or unexported fields
}

BaseMultilayerPerceptron64 closely matches sklearn/neural_network/multilayer_perceptron.py

func NewBaseMultilayerPerceptron64 

func NewBaseMultilayerPerceptron64() *BaseMultilayerPerceptron64

NewBaseMultilayerPerceptron64 returns a BaseMultilayerPerceptron64 with defaults

func (*BaseMultilayerPerceptron64) Fit 

func (mlp *BaseMultilayerPerceptron64) Fit(X, Y Matrix)

Fit compute Coefs and Intercepts

func (*BaseMultilayerPerceptron64) GetNOutputs 

func (mlp *BaseMultilayerPerceptron64) GetNOutputs() int

GetNOutputs returns output columns number for Y to pass to predict

func (*BaseMultilayerPerceptron64) IsClassifier 

func (mlp *BaseMultilayerPerceptron64) IsClassifier() bool

IsClassifier return true if LossFuncName is not square_loss

func (*BaseMultilayerPerceptron64) Predict 

func (mlp *BaseMultilayerPerceptron64) Predict(X mat.Matrix, Y Mutable)

Predict do forward pass and fills Y (Y must be Mutable)

func (*BaseMultilayerPerceptron64) Score 

func (mlp *BaseMultilayerPerceptron64) Score(Xmatrix, Ymatrix mat.Matrix) float64

Score for BaseMultiLayerPerceptron64 is R2Score or Accuracy depending on LossFuncName

func (*BaseMultilayerPerceptron64) SetParams 

func (mlp *BaseMultilayerPerceptron64) SetParams(params map[string]interface{})

SetParams allow settings params from a map. (used by Unmarshal)

func (*BaseMultilayerPerceptron64) Unmarshal 

func (mlp *BaseMultilayerPerceptron64) Unmarshal(buf []byte) error

Unmarshal init params intercepts_ coefs_ from json

type Float32Slice 

type Float32Slice []float32

Float32Slice implements sort.Interface.

func (Float32Slice) Len 

func (p Float32Slice) Len() int

func (Float32Slice) Less 

func (p Float32Slice) Less(i, j int) bool

func (Float32Slice) Swap 

func (p Float32Slice) Swap(i, j int)

type Float64Slice 

type Float64Slice []float64

Float64Slice implements sort.Interface.

func (Float64Slice) Len 

func (p Float64Slice) Len() int

func (Float64Slice) Less 

func (p Float64Slice) Less(i, j int) bool

func (Float64Slice) Swap 

func (p Float64Slice) Swap(i, j int)

type General32 

type General32 blas32.General

General32 is like blas32.General

func FromDense32 

func FromDense32(dst Mutable, dense General32) General32

FromDense32 fills dst (mat.Mutable) with src (mat.Dense)

func ToDense32 

func ToDense32(m Matrix) General32

ToDense32 returns w view of m if m is a RawMatrixer, et returns a dense copy of m

func (General32) At 

func (mat General32) At(r, c int) float64

At returns value at row,col

func (*General32) Copy 

func (mat *General32) Copy(a Matrix)

Copy fills receiver with input matrix

func (General32) Dims 

func (mat General32) Dims() (r, c int)

Dims return number of rows and columns

func (General32) Len 

func (mat General32) Len() int

Len returns row count

func (General32) Less 

func (mat General32) Less(i, j int) bool

Less compare rows. panics if Cols!=1

func (General32) RawMatrix 

func (mat General32) RawMatrix() blas32General

RawMatrix return blas raw matrix

func (General32) RawRowView 

func (mat General32) RawRowView(i int) []float32

RawRowView returns row as a float slice

func (General32) RowSlice 

func (mat General32) RowSlice(i, j int) General32

RowSlice provides view on submatrix(startRow,endRow) as General32 returned matrix can be casted to *General32

func (General32) Set 

func (mat General32) Set(r, c int, v float64)

Set set value at row,col

func (General32) Slice 

func (mat General32) Slice(i, j, k, l int) Matrix

Slice provides view on submatrix(startRow,endRow,startCol,endCol) returned matrix can be casted to *General32

func (*General32) SumRows 

func (mat *General32) SumRows(a General32)

SumRows sums rows of a into mat

func (General32) Swap 

func (mat General32) Swap(i, j int)

Swap permutes 2 lines {

func (General32) T 

func (mat General32) T() Matrix

T returns transposed Matrix

type General64 

type General64 blas64.General

General64 is like blas64.General

func FromDense64 

func FromDense64(dst Mutable, dense General64) General64

FromDense64 fills dst (mat.Mutable) with src (mat.Dense)

func ToDense64 

func ToDense64(m Matrix) General64

ToDense64 returns w view of m if m is a RawMatrixer, et returns a dense copy of m

func (General64) At 

func (mat General64) At(r, c int) float64

At returns value at row,col

func (*General64) Copy 

func (mat *General64) Copy(a Matrix)

Copy fills receiver with input matrix

func (General64) Dims 

func (mat General64) Dims() (r, c int)

Dims return number of rows and columns

func (General64) Len 

func (mat General64) Len() int

Len returns row count

func (General64) Less 

func (mat General64) Less(i, j int) bool

Less compare rows. panics if Cols!=1

func (General64) RawMatrix 

func (mat General64) RawMatrix() blas64General

RawMatrix return blas raw matrix

func (General64) RawRowView 

func (mat General64) RawRowView(i int) []float64

RawRowView returns row as a float slice

func (General64) RowSlice 

func (mat General64) RowSlice(i, j int) General64

RowSlice provides view on submatrix(startRow,endRow) as General64 returned matrix can be casted to *General64

func (General64) Set 

func (mat General64) Set(r, c int, v float64)

Set set value at row,col

func (General64) Slice 

func (mat General64) Slice(i, j, k, l int) Matrix

Slice provides view on submatrix(startRow,endRow,startCol,endCol) returned matrix can be casted to *General64

func (*General64) SumRows 

func (mat *General64) SumRows(a General64)

SumRows sums rows of a into mat

func (General64) Swap 

func (mat General64) Swap(i, j int)

Swap permutes 2 lines {

func (General64) T 

func (mat General64) T() Matrix

T returns transposed Matrix

type GeneralXX 

type GeneralXX = General32

GeneralXX is for easy tranposition to float32 or float64

type LabelBinarizer32 

type LabelBinarizer32 struct {
	NegLabel, PosLabel float32
	Classes            [][]float32
}

LabelBinarizer32 Binarize labels in a one-vs-all fashion

func NewLabelBinarizer32 

func NewLabelBinarizer32(NegLabel, PosLabel float32) *LabelBinarizer32

NewLabelBinarizer32 ...

func (*LabelBinarizer32) Fit 

func (m *LabelBinarizer32) Fit(Xmatrix, Ymatrix mat.Matrix) base.Fiter

Fit for binarizer register classes

func (*LabelBinarizer32) FitTransform 

func (m *LabelBinarizer32) FitTransform(X, Y mat.Matrix) (Xout, Yout General32)

FitTransform fit to data, then transform it

func (*LabelBinarizer32) InverseTransform 

func (m *LabelBinarizer32) InverseTransform(X, Y General32) (Xout, Yout General32)

InverseTransform for LabelBinarizer32

func (*LabelBinarizer32) Transform 

func (m *LabelBinarizer32) Transform(X, Y mat.Matrix) (Xout, Yout General32)

Transform for LabelBinarizer32

func (*LabelBinarizer32) TransformerClone 

func (m *LabelBinarizer32) TransformerClone() *LabelBinarizer32

TransformerClone ...

type LabelBinarizer64 

type LabelBinarizer64 struct {
	NegLabel, PosLabel float64
	Classes            [][]float64
}

LabelBinarizer64 Binarize labels in a one-vs-all fashion

func NewLabelBinarizer64 

func NewLabelBinarizer64(NegLabel, PosLabel float64) *LabelBinarizer64

NewLabelBinarizer64 ...

func (*LabelBinarizer64) Fit 

func (m *LabelBinarizer64) Fit(Xmatrix, Ymatrix mat.Matrix) base.Fiter

Fit for binarizer register classes

func (*LabelBinarizer64) FitTransform 

func (m *LabelBinarizer64) FitTransform(X, Y mat.Matrix) (Xout, Yout General64)

FitTransform fit to data, then transform it

func (*LabelBinarizer64) InverseTransform 

func (m *LabelBinarizer64) InverseTransform(X, Y General64) (Xout, Yout General64)

InverseTransform for LabelBinarizer64

func (*LabelBinarizer64) Transform 

func (m *LabelBinarizer64) Transform(X, Y mat.Matrix) (Xout, Yout General64)

Transform for LabelBinarizer64

func (*LabelBinarizer64) TransformerClone 

func (m *LabelBinarizer64) TransformerClone() *LabelBinarizer64

TransformerClone ...

type MLPClassifier 

type MLPClassifier struct{ BaseMultilayerPerceptron64 }

MLPClassifier ...

func NewMLPClassifier 

func NewMLPClassifier(hiddenLayerSizes []int, activation string, solver string, Alpha float64) *MLPClassifier

NewMLPClassifier returns a *MLPClassifier with defaults activation is one of logistic,tanh,relu solver is on of agd,adagrad,rmsprop,adadelta,adam (one of the keys of base.Solvers) defaults to "adam" Alpha is the regularization parameter lossName is one of square,log,cross-entropy (one of the keys of lm.LossFunctions) defaults to "log"

func (*MLPClassifier) Fit 

func (mlp *MLPClassifier) Fit(Xmatrix, Ymatrix mat.Matrix) base.Fiter

Fit ...

Example (Breast_cancer) 
ds := datasets.LoadBreastCancer()

scaler := preprocessing.NewStandardScaler()
scaler.Fit(ds.X, ds.Y)
X0, Y0 := scaler.Transform(ds.X, ds.Y)
nSamples, _ := Y0.Dims()
pca := preprocessing.NewPCA()
pca.Fit(X0, Y0)
X1, Y1 := pca.Transform(X0, Y0)
thres := .995
ExplainedVarianceRatio := 0.
var nComponents int
for nComponents = 0; nComponents < len(pca.ExplainedVarianceRatio) && ExplainedVarianceRatio < thres; nComponents++ {
	ExplainedVarianceRatio += pca.ExplainedVarianceRatio[nComponents]
}
fmt.Printf("ExplainedVarianceRatio %.3f %.3f\n", ExplainedVarianceRatio, pca.ExplainedVarianceRatio[0:nComponents])
fmt.Printf("%d components explain %.2f%% of variance\n", nComponents, thres*100.)
X1 = X1.Slice(0, nSamples, 0, nComponents).(*mat.Dense)
poly := preprocessing.NewPolynomialFeatures(2)
poly.IncludeBias = false

poly.Fit(X1, Y1)
X2, Y2 := poly.Transform(X1, Y1)

m := NewMLPClassifier([]int{}, "logistic", "adam", 0.)
m.RandomState = base.NewLockedSource(1)
m.LearningRateInit = .02
m.WeightDecay = .001
m.MaxIter = 300

log.SetPrefix("ExampleMLPClassifier_Fit_breast_cancer:")
defer log.SetPrefix("")
m.Fit(X2, Y2)
accuracy := m.Score(X2, Y2)
if accuracy <= .999 {
	fmt.Printf("accuracy:%.9f\n", accuracy)
} else {
	fmt.Println("accuracy>0.999 ? true")
}

Output:

ExplainedVarianceRatio 0.996 [0.443 0.190 0.094 0.066 0.055 0.040 0.023 0.016 0.014 0.012 0.010 0.009 0.008 0.005 0.003 0.003 0.002 0.002 0.002 0.001]
20 components explain 99.50% of variance
accuracy>0.999 ? true
Example (Iris) 
// adapted from http://scikit-learn.org/stable/_downloads/plot_iris_logistic.ipynb
ds := datasets.LoadIris()

// we only take the first _ features.
nSamples, _ := ds.X.Dims()
X, YTrueClasses := ds.X.Slice(0, nSamples, 0, 2).(*mat.Dense), ds.Y
h := .02 // step size in the mesh

mlp := NewMLPClassifier([]int{}, "logistic", "lbfgs", 1e-5)

log.SetPrefix("ExampleMLPClassifier_Fit_iris:")
defer log.SetPrefix("")

// we create an instance of our Classifier and fit the data.
mlp.Fit(X, YTrueClasses)

accuracy := mlp.Score(X, YTrueClasses)
if accuracy >= 0.833 {
	fmt.Println("ok")
} else {
	fmt.Printf("Accuracy:%.3f\n", accuracy)
}

// Put the result into a color plot
if *visualDebug {
	// Plot the decision boundary. For that, we will assign a color to each point in the mesh [x_min, x_max]x[y_min, y_max].
	var xmin, xmax = mat.Min(X.ColView(0)) - .5, mat.Max(X.ColView(0)) + .5

	var ymin, ymax = mat.Min(X.ColView(1)) - .5, mat.Max(X.ColView(1)) + .5

	// xx, yy = np.meshgrid(np.arange(x_min, x_max, h), np.arange(y_min, y_max, h))
	nparange := func(min, max, h float64) []float64 {
		c := make([]float64, 0)
		for v := min; v <= max; v += h {
			c = append(c, v)
		}
		return c
	}
	npmeshgrid := func(xrange, yrange []float64) (xx, yy []float64) {
		for y := ymin; y <= ymax; y += h {
			for x := xmin; x <= xmax; x += h {
				xx = append(xx, x)
				yy = append(yy, y)
			}
		}
		return
	}
	npc := func(c ...[]float64) (XZ *mat.Dense) {
		XZ = mat.NewDense(len(c[0]), len(c), nil)
		for j, src := range c {
			XZ.SetCol(j, src)
		}
		return
	}
	var xx, yy = npmeshgrid(nparange(xmin, xmax, h), nparange(ymin, ymax, h))
	Xgrid := npc(xx, yy)
	Z := &mat.Dense{}
	mlp.Predict(Xgrid, Z)

	plt, _ := plot.New()
	xys := func(X, Y mat.Matrix, cls int) (xy plotter.XYs) {
		imax, _ := Y.Dims()
		for i := 0; i < imax; i++ {
			if int(Y.At(i, 0)) == cls {
				xy = append(xy, struct{ X, Y float64 }{X.At(i, 0), X.At(i, 1)})
			}
		}
		return
	}
	colors1 := []color.RGBA{{166, 206, 227, 255}, {253, 191, 111, 255}, {177, 89, 40, 255}}
	for cls := 0; cls <= 2; cls++ {
		s, _ := plotter.NewScatter(xys(Xgrid, Z, cls))
		s.GlyphStyle.Shape = draw.BoxGlyph{}
		s.GlyphStyle.Color = colors1[cls]
		s.GlyphStyle.Radius = 1
		plt.Add(s)

		s1, _ := plotter.NewScatter(xys(X, YTrueClasses, cls))
		s1.GlyphStyle.Shape = draw.CircleGlyph{}
		s1.GlyphStyle.Radius = 4
		s1.GlyphStyle.Color = colors1[cls]
		plt.Add(s1)
		plt.Legend.Add(ds.TargetNames[cls], s1)
	}
	plt.X.Label.Text = ds.FeatureNames[0]
	plt.Y.Label.Text = ds.FeatureNames[1]
	// Save the plot to a PNG file.
	pngfile := "/tmp/ExampleMLPClassifier_Fit_iris.png"
	os.Remove(pngfile)
	if err := plt.Save(7*vg.Inch, 7*vg.Inch, pngfile); err != nil {
		panic(err)
	}
	cmd := exec.Command("display", pngfile)
	err := cmd.Start()
	if err != nil {
		fmt.Println(err.Error())
	}
	time.Sleep(200 * time.Millisecond)
	os.Remove(pngfile)

}

Output:

ok
Example (Mnist) 
// fitting mnist with randomstate 7, shuffle, batchnorm,400 iterations should allow accuracy 99.96%. use embedded label binarizer

MaxIter := 400
expectedMinAccuracy := .999
if testing.Short() {
	log.Println("ExampleMLPClassifier_Fit_mnist reducted iterations because testing with -short")
	MaxIter = 40
	expectedMinAccuracy = .95

}
X, Y := datasets.LoadMnist()
mlp := NewMLPClassifier([]int{25}, "logistic", "adam", 0)
mlp.RandomState = base.NewLockedSource(7)
mlp.Shuffle = true
mlp.BatchNormalize = true
mlp.MaxIter = MaxIter

log.SetPrefix("ExampleMLPClassifier_Fit_mnist:")
defer log.SetPrefix("")

mlp.Fit(X, Y)
pred := mlp.Predict(X, nil)
acc := metrics.AccuracyScore(Y, pred, true, nil)
if acc < expectedMinAccuracy {
	fmt.Printf("Accuracy:%.2f%%\n", acc*100)
} else {
	fmt.Println("ok")
}

Output:

ok

func (*MLPClassifier) IsClassifier 

func (*MLPClassifier) IsClassifier() bool

IsClassifier returns true for MLPClassifier

func (*MLPClassifier) Predict 

func (mlp *MLPClassifier) Predict(X mat.Matrix, Ymutable mat.Mutable) *mat.Dense

Predict return the forward result for MLPClassifier

Example (Mnist) 
X, Y := datasets.LoadMnist()
lb := preprocessing.NewLabelBinarizer(0, 1)
X, Ybin := lb.FitTransform(X, Y)
Theta1T, Theta2T := datasets.LoadMnistWeights()
mlp := NewMLPClassifier([]int{25}, "logistic", "adam", 0)
mlp.Shuffle = false
mlp.initialize(Ybin.RawMatrix().Cols, []int{400, 25, 10}, true, true)
mat.NewDense(401, 25, mlp.packedParameters[:401*25]).Copy(Theta1T.T())
mat.NewDense(26, 10, mlp.packedParameters[401*25:]).Copy(Theta2T.T())
mlp.WarmStart = true

predBin := mat.NewDense(Ybin.RawMatrix().Rows, Ybin.RawMatrix().Cols, nil)
mlp.Predict(X, predBin)
//_, pred := lb.InverseTransform(nil, predBin)
acc := metrics.AccuracyScore(Ybin, predBin, true, nil)
fmt.Printf("Accuracy:%.2f%%\n", acc*100)

Output:

Accuracy:97.52%

func (*MLPClassifier) PredicterClone 

func (mlp *MLPClassifier) PredicterClone() base.Predicter

PredicterClone returns an (possibly unfitted) copy of predicter

func (*MLPClassifier) Score 

func (mlp *MLPClassifier) Score(Xmatrix, Ymatrix mat.Matrix) float64

Score for MLPClassifier computes accuracy score

type MLPRegressor 

type MLPRegressor struct{ BaseMultilayerPerceptron64 }

MLPRegressor ...

func NewMLPRegressor 

func NewMLPRegressor(hiddenLayerSizes []int, activation string, solver string, Alpha float64) *MLPRegressor

NewMLPRegressor returns a *MLPRegressor with defaults activation is one of identity,logistic,tanh,relu solver is on of sgd,adam defaults to "adam" Alpha is the regularization parameter

func (*MLPRegressor) Fit 

func (mlp *MLPRegressor) Fit(Xmatrix, Ymatrix mat.Matrix) base.Fiter

Fit ...

Example (Boston) 
// exmaple inspired from # https://machinelearningmastery.com/regression-tutorial-keras-deep-learning-library-python/
// with wider_model
// added weight decay and reduced epochs from 100 to 20
ds := datasets.LoadBoston()
X, Y := ds.X, ds.Y

mlp := NewMLPRegressor([]int{20}, "relu", "adam", 0)
mlp.RandomState = base.NewLockedSource(1)
mlp.LearningRateInit = .05
mlp.WeightDecay = .01
mlp.Shuffle = false
mlp.BatchSize = 5
mlp.MaxIter = 100
m := pipeline.MakePipeline(preprocessing.NewStandardScaler(), mlp)
_ = m
randomState := rand.New(base.NewLockedSource(7))
scorer := func(Y, Ypred mat.Matrix) float64 {
	e := metrics.MeanSquaredError(Y, Ypred, nil, "").At(0, 0)
	return e
}
mean := func(x []float64) float64 { return floats.Sum(x) / float64(len(x)) }

log.SetPrefix("ExampleMLPRegressor_Fit_boston:")
defer log.SetPrefix("")
res := modelselection.CrossValidate(m, X, Y,
	nil,
	scorer,
	&modelselection.KFold{NSplits: 10, Shuffle: true, RandomState: randomState}, 10)
fmt.Println(math.Sqrt(mean(res.TestScore)) < 20)

Output:

true

func (*MLPRegressor) IsClassifier 

func (*MLPRegressor) IsClassifier() bool

IsClassifier returns false for MLPRegressor

func (*MLPRegressor) Predict 

func (mlp *MLPRegressor) Predict(X mat.Matrix, Ymutable mat.Mutable) *mat.Dense

Predict return the forward result

func (*MLPRegressor) PredictProbas 

func (mlp *MLPRegressor) PredictProbas(X mat.Matrix, Ymutable mat.Mutable) *mat.Dense

PredictProbas return the probability estimate

func (*MLPRegressor) PredicterClone 

func (mlp *MLPRegressor) PredicterClone() base.Predicter

PredicterClone allow clone predicter for pipeline on model_selection

func (*MLPRegressor) Score 

func (mlp *MLPRegressor) Score(X, Y mat.Matrix) float64

Score for MLPRegressor returns R2Score

type Matrix 

type Matrix = mat.Matrix

Matrix interface (identical to gonum/mat one's)

type Mutable 

type Mutable interface {
	Set(i, j int, v float64)
	Matrix
}

Mutable provide Set to set value at row,col

type Optimizer32 

type Optimizer32 interface {
	// contains filtered or unexported methods
}

Optimizer32 is an interface for stochastic optimizers

type Optimizer64 

type Optimizer64 interface {
	// contains filtered or unexported methods
}

Optimizer64 is an interface for stochastic optimizers

type RawMatrixer32 

type RawMatrixer32 interface {
	RawMatrix() blas32General
}

RawMatrixer32 provide access to blas matrix

type RawMatrixer64 

type RawMatrixer64 interface {
	RawMatrix() blas64General
}

RawMatrixer64 provide access to blas matrix

type RawRowViewer 

type RawRowViewer = RawRowViewer64

RawRowViewer returns row as a float slice

type RawRowViewer32 

type RawRowViewer32 interface {
	RawRowView(i int) []float32
}

RawRowViewer32 returns row as a float slice

type RawRowViewer64 

type RawRowViewer64 interface {
	RawRowView(i int) []float64
}

RawRowViewer64 returns row as a float slice

type RawRowViewerXX 

type RawRowViewerXX = RawRowViewer32

RawRowViewerXX returns row as a float slice

type SGDOptimizer32 

type SGDOptimizer32 struct {
	Params           []float32
	LearningRateInit float32
	LearningRate     float32
	PowerT           float32
	LRSchedule       string
	Momentum         float32
	Nesterov         bool
	// contains filtered or unexported fields
}

SGDOptimizer32 is the stochastic gradient descent optimizer

type SGDOptimizer64 

type SGDOptimizer64 struct {
	Params           []float64
	LearningRateInit float64
	LearningRate     float64
	PowerT           float64
	LRSchedule       string
	Momentum         float64
	Nesterov         bool
	// contains filtered or unexported fields
}

SGDOptimizer64 is the stochastic gradient descent optimizer

type Slicer 

type Slicer interface {
	Slice(i, j, k, l int) Matrix
}

Slicer provides Slice(startRow,endRow,startCol,endCol)

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