draft: implement DeepFM from scratch

common/dataset/dataset.go

@@ -0,0 +1,184 @@
+// Copyright 2024 gorse Project Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package dataset
+
+import (
+	"archive/zip"
+	"encoding/csv"
+	"fmt"
+	"github.com/zhenghaoz/gorse/base/log"
+	"github.com/zhenghaoz/gorse/common/util"
+	"go.uber.org/zap"
+	"io"
+	"net/http"
+	"os"
+	"os/user"
+	"path/filepath"
+	"strings"
+)
+
+var (
+	tempDir    string
+	datasetDir string
+)
+
+func init() {
+	usr, err := user.Current()
+	if err != nil {
+		log.Logger().Fatal("failed to get user directory", zap.Error(err))
+	}
+	datasetDir = filepath.Join(usr.HomeDir, ".gorse", "dataset")
+	tempDir = filepath.Join(usr.HomeDir, ".gorse", "temp")
+}
+
+func LoadIris() ([][]float32, []int, error) {
+	// Download dataset
+	path, err := downloadAndUnzip("iris")
+	if err != nil {
+		return nil, nil, err
+	}
+	dataFile := filepath.Join(path, "iris.data")
+	// Load data
+	f, err := os.Open(dataFile)
+	if err != nil {
+		return nil, nil, err
+	}
+	reader := csv.NewReader(f)
+	rows, err := reader.ReadAll()
+	if err != nil {
+		return nil, nil, err
+	}
+	// Parse data
+	data := make([][]float32, len(rows))
+	target := make([]int, len(rows))
+	types := make(map[string]int)
+	for i, row := range rows {
+		data[i] = make([]float32, 4)
+		for j, cell := range row[:4] {
+			data[i][j], err = util.ParseFloat32(cell)
+			if err != nil {
+				return nil, nil, err
+			}
+		}
+		if _, exist := types[row[4]]; !exist {
+			types[row[4]] = len(types)
+		}
+		target[i] = types[row[4]]
+	}
+	return data, target, nil
+}
+
+func downloadAndUnzip(name string) (string, error) {
+	url := fmt.Sprintf("https://pub-64226d9f34c64d6f829f5b63a5540d27.r2.dev/datasets/%s.zip", name)
+	path := filepath.Join(datasetDir, name)
+	if _, err := os.Stat(path); os.IsNotExist(err) {
+		zipFileName, _ := downloadFromUrl(url, tempDir)
+		if _, err := unzip(zipFileName, path); err != nil {
+			return "", err
+		}
+	}
+	return path, nil
+}
+
+// downloadFromUrl downloads file from URL.
+func downloadFromUrl(src, dst string) (string, error) {
+	log.Logger().Info("Download dataset", zap.String("source", src), zap.String("destination", dst))
+	// Extract file name
+	tokens := strings.Split(src, "/")
+	fileName := filepath.Join(dst, tokens[len(tokens)-1])
+	// Create file
+	if err := os.MkdirAll(filepath.Dir(fileName), os.ModePerm); err != nil {
+		return fileName, err
+	}
+	output, err := os.Create(fileName)
+	if err != nil {
+		log.Logger().Error("failed to create file", zap.Error(err), zap.String("filename", fileName))
+		return fileName, err
+	}
+	defer output.Close()
+	// Download file
+	response, err := http.Get(src)
+	if err != nil {
+		log.Logger().Error("failed to download", zap.Error(err), zap.String("source", src))
+		return fileName, err
+	}
+	defer response.Body.Close()
+	// Save file
+	_, err = io.Copy(output, response.Body)
+	if err != nil {
+		log.Logger().Error("failed to download", zap.Error(err), zap.String("source", src))
+		return fileName, err
+	}
+	return fileName, nil
+}
+
+// unzip zip file.
+func unzip(src, dst string) ([]string, error) {
+	var fileNames []string
+	// Open zip file
+	r, err := zip.OpenReader(src)
+	if err != nil {
+		return fileNames, err
+	}
+	defer r.Close()
+	// Extract files
+	for _, f := range r.File {
+		// Open file
+		rc, err := f.Open()
+		if err != nil {
+			return fileNames, err
+		}
+		// Store filename/path for returning and using later on
+		filePath := filepath.Join(dst, f.Name)
+		// Check for ZipSlip. More Info: http://bit.ly/2MsjAWE
+		if !strings.HasPrefix(filePath, filepath.Clean(dst)+string(os.PathSeparator)) {
+			return fileNames, fmt.Errorf("%s: illegal file path", filePath)
+		}
+		// Add filename
+		fileNames = append(fileNames, filePath)
+		if f.FileInfo().IsDir() {
+			// Create folder
+			if err = os.MkdirAll(filePath, os.ModePerm); err != nil {
+				return fileNames, err
+			}
+		} else {
+			// Create all folders
+			if err = os.MkdirAll(filepath.Dir(filePath), os.ModePerm); err != nil {
+				return fileNames, err
+			}
+			// Create file
+			outFile, err := os.OpenFile(filePath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode())
+			if err != nil {
+				return fileNames, err
+			}
+			// Save file
+			_, err = io.Copy(outFile, rc)
+			if err != nil {
+				return nil, err
+			}
+			// Close the file without defer to close before next iteration of loop
+			err = outFile.Close()
+			if err != nil {
+				return nil, err
+			}
+		}
+		// Close file
+		err = rc.Close()
+		if err != nil {
+			return nil, err
+		}
+	}
+	return fileNames, nil
+}

common/dataset/dataset_test.go

@@ -0,0 +1,14 @@
+package dataset
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestLoadIris(t *testing.T) {
+	data, target, err := LoadIris()
+	assert.NoError(t, err)
+	assert.Len(t, data, 150)
+	assert.Len(t, data[0], 4)
+	assert.Len(t, target, 150)
+}