feat(modules): migrate to go modules and bump go version 1.14.4

- migrate to go module
- bump go version 1.14.4

Signed-off-by: prateekpandey14 <prateek.pandey@mayadata.io>

vendor/gonum.org/v1/gonum/mat/symband.go

@@ -0,0 +1,221 @@
+// Copyright ©2017 The Gonum Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package mat
+
+import (
+	"gonum.org/v1/gonum/blas"
+	"gonum.org/v1/gonum/blas/blas64"
+)
+
+var (
+	symBandDense *SymBandDense
+	_            Matrix           = symBandDense
+	_            Symmetric        = symBandDense
+	_            Banded           = symBandDense
+	_            SymBanded        = symBandDense
+	_            RawSymBander     = symBandDense
+	_            MutableSymBanded = symBandDense
+
+	_ NonZeroDoer    = symBandDense
+	_ RowNonZeroDoer = symBandDense
+	_ ColNonZeroDoer = symBandDense
+)
+
+// SymBandDense represents a symmetric band matrix in dense storage format.
+type SymBandDense struct {
+	mat blas64.SymmetricBand
+}
+
+// SymBanded is a symmetric band matrix interface type.
+type SymBanded interface {
+	Banded
+
+	// Symmetric returns the number of rows/columns in the matrix.
+	Symmetric() int
+
+	// SymBand returns the number of rows/columns in the matrix, and the size of
+	// the bandwidth.
+	SymBand() (n, k int)
+}
+
+// MutableSymBanded is a symmetric band matrix interface type that allows elements
+// to be altered.
+type MutableSymBanded interface {
+	SymBanded
+	SetSymBand(i, j int, v float64)
+}
+
+// A RawSymBander can return a blas64.SymmetricBand representation of the receiver.
+// Changes to the blas64.SymmetricBand.Data slice will be reflected in the original
+// matrix, changes to the N, K, Stride and Uplo fields will not.
+type RawSymBander interface {
+	RawSymBand() blas64.SymmetricBand
+}
+
+// NewSymBandDense creates a new SymBand matrix with n rows and columns. If data == nil,
+// a new slice is allocated for the backing slice. If len(data) == n*(k+1),
+// data is used as the backing slice, and changes to the elements of the returned
+// SymBandDense will be reflected in data. If neither of these is true, NewSymBandDense
+// will panic. k must be at least zero and less than n, otherwise NewSymBandDense will panic.
+//
+// The data must be arranged in row-major order constructed by removing the zeros
+// from the rows outside the band and aligning the diagonals. SymBandDense matrices
+// are stored in the upper triangle. For example, the matrix
+//    1  2  3  0  0  0
+//    2  4  5  6  0  0
+//    3  5  7  8  9  0
+//    0  6  8 10 11 12
+//    0  0  9 11 13 14
+//    0  0  0 12 14 15
+// becomes (* entries are never accessed)
+//     1  2  3
+//     4  5  6
+//     7  8  9
+//    10 11 12
+//    13 14  *
+//    15  *  *
+// which is passed to NewSymBandDense as []float64{1, 2, ..., 15, *, *, *} with k=2.
+// Only the values in the band portion of the matrix are used.
+func NewSymBandDense(n, k int, data []float64) *SymBandDense {
+	if n <= 0 || k < 0 {
+		if n == 0 {
+			panic(ErrZeroLength)
+		}
+		panic("mat: negative dimension")
+	}
+	if k+1 > n {
+		panic("mat: band out of range")
+	}
+	bc := k + 1
+	if data != nil && len(data) != n*bc {
+		panic(ErrShape)
+	}
+	if data == nil {
+		data = make([]float64, n*bc)
+	}
+	return &SymBandDense{
+		mat: blas64.SymmetricBand{
+			N:      n,
+			K:      k,
+			Stride: bc,
+			Uplo:   blas.Upper,
+			Data:   data,
+		},
+	}
+}
+
+// Dims returns the number of rows and columns in the matrix.
+func (s *SymBandDense) Dims() (r, c int) {
+	return s.mat.N, s.mat.N
+}
+
+// Symmetric returns the size of the receiver.
+func (s *SymBandDense) Symmetric() int {
+	return s.mat.N
+}
+
+// Bandwidth returns the bandwidths of the matrix.
+func (s *SymBandDense) Bandwidth() (kl, ku int) {
+	return s.mat.K, s.mat.K
+}
+
+// SymBand returns the number of rows/columns in the matrix, and the size of
+// the bandwidth.
+func (s *SymBandDense) SymBand() (n, k int) {
+	return s.mat.N, s.mat.K
+}
+
+// T implements the Matrix interface. Symmetric matrices, by definition, are
+// equal to their transpose, and this is a no-op.
+func (s *SymBandDense) T() Matrix {
+	return s
+}
+
+// TBand implements the Banded interface.
+func (s *SymBandDense) TBand() Banded {
+	return s
+}
+
+// RawSymBand returns the underlying blas64.SymBand used by the receiver.
+// Changes to elements in the receiver following the call will be reflected
+// in returned blas64.SymBand.
+func (s *SymBandDense) RawSymBand() blas64.SymmetricBand {
+	return s.mat
+}
+
+// SetRawSymBand sets the underlying blas64.SymmetricBand used by the receiver.
+// Changes to elements in the receiver following the call will be reflected
+// in the input.
+//
+// The supplied SymmetricBand must use blas.Upper storage format.
+func (s *SymBandDense) SetRawSymBand(mat blas64.SymmetricBand) {
+	if mat.Uplo != blas.Upper {
+		panic("mat: blas64.SymmetricBand does not have blas.Upper storage")
+	}
+	s.mat = mat
+}
+
+// Zero sets all of the matrix elements to zero.
+func (s *SymBandDense) Zero() {
+	for i := 0; i < s.mat.N; i++ {
+		u := min(1+s.mat.K, s.mat.N-i)
+		zero(s.mat.Data[i*s.mat.Stride : i*s.mat.Stride+u])
+	}
+}
+
+// DiagView returns the diagonal as a matrix backed by the original data.
+func (s *SymBandDense) DiagView() Diagonal {
+	n := s.mat.N
+	return &DiagDense{
+		mat: blas64.Vector{
+			N:    n,
+			Inc:  s.mat.Stride,
+			Data: s.mat.Data[:(n-1)*s.mat.Stride+1],
+		},
+	}
+}
+
+// DoNonZero calls the function fn for each of the non-zero elements of s. The function fn
+// takes a row/column index and the element value of s at (i, j).
+func (s *SymBandDense) DoNonZero(fn func(i, j int, v float64)) {
+	for i := 0; i < s.mat.N; i++ {
+		for j := max(0, i-s.mat.K); j < min(s.mat.N, i+s.mat.K+1); j++ {
+			v := s.at(i, j)
+			if v != 0 {
+				fn(i, j, v)
+			}
+		}
+	}
+}
+
+// DoRowNonZero calls the function fn for each of the non-zero elements of row i of s. The function fn
+// takes a row/column index and the element value of s at (i, j).
+func (s *SymBandDense) DoRowNonZero(i int, fn func(i, j int, v float64)) {
+	if i < 0 || s.mat.N <= i {
+		panic(ErrRowAccess)
+	}
+	for j := max(0, i-s.mat.K); j < min(s.mat.N, i+s.mat.K+1); j++ {
+		v := s.at(i, j)
+		if v != 0 {
+			fn(i, j, v)
+		}
+	}
+}
+
+// DoColNonZero calls the function fn for each of the non-zero elements of column j of s. The function fn
+// takes a row/column index and the element value of s at (i, j).
+func (s *SymBandDense) DoColNonZero(j int, fn func(i, j int, v float64)) {
+	if j < 0 || s.mat.N <= j {
+		panic(ErrColAccess)
+	}
+	for i := 0; i < s.mat.N; i++ {
+		if i-s.mat.K <= j && j < i+s.mat.K+1 {
+			v := s.at(i, j)
+			if v != 0 {
+				fn(i, j, v)
+			}
+		}
+	}
+}