Implement the fine-tunes API (#130)

- Add FineTune Structs and Requests
- Add CRUD Methods

fine_tunes.go

@@ -0,0 +1,137 @@
+package openai
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+)
+
+type FineTuneRequest struct {
+	TrainingFile                 string    `json:"training_file"`
+	ValidationFile               string    `json:"validation_file,omitempty"`
+	Model                        string    `json:"model,omitempty"`
+	Epochs                       int       `json:"n_epochs,omitempty"`
+	BatchSize                    int       `json:"batch_size,omitempty"`
+	LearningRateMultiplier       float32   `json:"learning_rate_multiplier,omitempty"`
+	PromptLossRate               float32   `json:"prompt_loss_rate,omitempty"`
+	ComputeClassificationMetrics bool      `json:"compute_classification_metrics,omitempty"`
+	ClassificationClasses        int       `json:"classification_n_classes,omitempty"`
+	ClassificationPositiveClass  string    `json:"classification_positive_class,omitempty"`
+	ClassificationBetas          []float32 `json:"classification_betas,omitempty"`
+	Suffix                       string    `json:"suffix,omitempty"`
+}
+
+type FineTune struct {
+	ID              string              `json:"id"`
+	Object          string              `json:"object"`
+	Model           string              `json:"model"`
+	CreatedAt       int                 `json:"created_at"`
+	FineTunedModel  string              `json:"fine_tuned_model"`
+	Hyperparams     FineTuneHyperParams `json:"hyperparams"`
+	OrganizationID  string              `json:"organization_id"`
+	ResultFiles     []File              `json:"result_files"`
+	Status          string              `json:"status"`
+	ValidationFiles []File              `json:"validation_files"`
+	TrainingFiles   []File              `json:"training_files"`
+	UpdatedAt       int                 `json:"updated_at"`
+}
+
+type FineTuneEvent struct {
+	Object    string `json:"object"`
+	CreatedAt int    `json:"created_at"`
+	Level     string `json:"level"`
+	Message   string `json:"message"`
+}
+
+type FineTuneHyperParams struct {
+	BatchSize              int     `json:"batch_size"`
+	LearningRateMultiplier float64 `json:"learning_rate_multiplier"`
+	Epochs                 int     `json:"n_epochs"`
+	PromptLossWeight       float64 `json:"prompt_loss_weight"`
+}
+
+type FineTuneList struct {
+	Object string     `json:"object"`
+	Data   []FineTune `json:"data"`
+}
+type FineTuneEventList struct {
+	Object string          `json:"object"`
+	Data   []FineTuneEvent `json:"data"`
+}
+
+type FineTuneDeleteResponse struct {
+	ID      string `json:"id"`
+	Object  string `json:"object"`
+	Deleted bool   `json:"deleted"`
+}
+
+func (c *Client) CreateFineTune(ctx context.Context, request FineTuneRequest) (response FineTune, err error) {
+	var reqBytes []byte
+	reqBytes, err = json.Marshal(request)
+	if err != nil {
+		return
+	}
+
+	urlSuffix := "/fine-tunes"
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, c.fullURL(urlSuffix), bytes.NewBuffer(reqBytes))
+	if err != nil {
+		return
+	}
+
+	err = c.sendRequest(req, &response)
+	return
+}
+
+// Cancel a fine-tune job.
+func (c *Client) CancelFineTune(ctx context.Context, fineTuneID string) (response FineTune, err error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, c.fullURL("/fine-tunes/"+fineTuneID+"/cancel"), nil)
+	if err != nil {
+		return
+	}
+
+	err = c.sendRequest(req, &response)
+	return
+}
+
+func (c *Client) ListFineTunes(ctx context.Context) (response FineTuneList, err error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, c.fullURL("/fine-tunes"), nil)
+	if err != nil {
+		return
+	}
+
+	err = c.sendRequest(req, &response)
+	return
+}
+
+func (c *Client) GetFineTune(ctx context.Context, fineTuneID string) (response FineTune, err error) {
+	urlSuffix := fmt.Sprintf("/fine-tunes/%s", fineTuneID)
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, c.fullURL(urlSuffix), nil)
+	if err != nil {
+		return
+	}
+
+	err = c.sendRequest(req, &response)
+	return
+}
+
+func (c *Client) DeleteFineTune(ctx context.Context, fineTuneID string) (response FineTuneDeleteResponse, err error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodDelete, c.fullURL("/fine-tunes/"+fineTuneID), nil)
+	if err != nil {
+		return
+	}
+
+	err = c.sendRequest(req, &response)
+	return
+}
+
+func (c *Client) ListFineTuneEvents(ctx context.Context, fineTuneID string) (response FineTuneEventList, err error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, c.fullURL("/fine-tunes/"+fineTuneID+"/events"), nil)
+	if err != nil {
+		return
+	}
+
+	err = c.sendRequest(req, &response)
+	return
+}