External model inputs update

cli/cmd/get.go

@@ -382,7 +382,6 @@ func describeAPI(name string, resourcesRes *schema.GetResourcesResponse) (string
 
 	ctx := resourcesRes.Context
 	api := ctx.APIs[name]
-	model := ctx.Models[api.ModelName]
 
 	var staleReplicas int32
 	var ctxAPIStatus *resource.APIStatus
@@ -412,26 +411,29 @@ func describeAPI(name string, resourcesRes *schema.GetResourcesResponse) (string
 	}
 
 	out += titleStr("Endpoint")
-	resIDs := strset.New()
-	combinedInput := []interface{}{model.Input, model.TrainingInput}
-	for _, res := range ctx.ExtractCortexResources(combinedInput, resource.ConstantType, resource.RawColumnType, resource.AggregateType, resource.TransformedColumnType) {
-		resIDs.Add(res.GetID())
-		resIDs.Merge(ctx.AllComputedResourceDependencies(res.GetID()))
-	}
-	var samplePlaceholderFields []string
-	for rawColumnName, rawColumn := range ctx.RawColumns {
-		if resIDs.Has(rawColumn.GetID()) {
-			fieldStr := fmt.Sprintf("\"%s\": %s", rawColumnName, rawColumn.GetColumnType().JSONPlaceholder())
-			samplePlaceholderFields = append(samplePlaceholderFields, fieldStr)
-		}
-	}
-	sort.Strings(samplePlaceholderFields)
-	samplesPlaceholderStr := `{ "samples": [ { ` + strings.Join(samplePlaceholderFields, ", ") + " } ] }"
 	out += "URL:      " + urls.Join(resourcesRes.APIsBaseURL, anyAPIStatus.Path) + "\n"
 	out += "Method:   POST\n"
 	out += `Header:   "Content-Type: application/json"` + "\n"
-	out += "Payload:  " + samplesPlaceholderStr + "\n"
 
+	if api.Model != nil {
+		model := ctx.Models[api.ModelName]
+		resIDs := strset.New()
+		combinedInput := []interface{}{model.Input, model.TrainingInput}
+		for _, res := range ctx.ExtractCortexResources(combinedInput, resource.ConstantType, resource.RawColumnType, resource.AggregateType, resource.TransformedColumnType) {
+			resIDs.Add(res.GetID())
+			resIDs.Merge(ctx.AllComputedResourceDependencies(res.GetID()))
+		}
+		var samplePlaceholderFields []string
+		for rawColumnName, rawColumn := range ctx.RawColumns {
+			if resIDs.Has(rawColumn.GetID()) {
+				fieldStr := fmt.Sprintf("\"%s\": %s", rawColumnName, rawColumn.GetColumnType().JSONPlaceholder())
+				samplePlaceholderFields = append(samplePlaceholderFields, fieldStr)
+			}
+		}
+		sort.Strings(samplePlaceholderFields)
+		samplesPlaceholderStr := `{ "samples": [ { ` + strings.Join(samplePlaceholderFields, ", ") + " } ] }"
+		out += "Payload:  " + samplesPlaceholderStr + "\n"
+	}
 	if api != nil {
 		out += resourceStr(api.API)
 	}

cli/cmd/lib_cli_config.go

@@ -59,10 +59,11 @@ func getPromptValidation(defaults *CliConfig) *cr.PromptValidation {
 				PromptOpts: &cr.PromptOptions{
 					Prompt: "Enter Cortex operator endpoint",
 				},
-				StringValidation: cr.GetURLValidation(&cr.URLValidation{
-					Required: true,
-					Default:  defaults.CortexURL,
-				}),
+				StringValidation: &cr.StringValidation{
+					Required:  true,
+					Default:   defaults.CortexURL,
+					Validator: cr.GetURLValidator(false, false),
+				},
 			},
 			{
 				StructField: "AWSAccessKeyID",
@@ -97,9 +98,10 @@ var fileValidation = &cr.StructValidation{
 		{
 			Key:         "cortex_url",
 			StructField: "CortexURL",
-			StringValidation: cr.GetURLValidation(&cr.URLValidation{
-				Required: true,
-			}),
+			StringValidation: &cr.StringValidation{
+				Required:  true,
+				Validator: cr.GetURLValidator(false, false),
+			},
 		},
 		{
 			Key:         "aws_access_key_id",

cli/cmd/predict.go

@@ -109,6 +109,16 @@ var predictCmd = &cobra.Command{
 		}
 
 		for _, prediction := range predictResponse.Predictions {
+			if prediction.Prediction == nil {
+				prettyResp, err := json.Pretty(prediction.Response)
+				if err != nil {
+					errors.Exit(err)
+				}
+
+				fmt.Println(prettyResp)
+				continue
+			}
+
 			value := prediction.Prediction
 			if prediction.PredictionReversed != nil {
 				value = prediction.PredictionReversed

docs/applications/advanced/external-models.md

@@ -0,0 +1,29 @@
+# Importing External Models
+
+You can serve a model that was trained outside of Cortex as an API.
+
+1. Zip the exported estimator output in your checkpoint directory, e.g.
+
+```bash
+$ ls export/estimator
+saved_model.pb  variables/
+
+$ zip -r model.zip export/estimator
+```
+
+2. Upload the zipped file to Amazon S3, e.g.
+
+```bash
+$ aws s3 cp model.zip s3://your-bucket/model.zip
+```
+
+3. Specify `model_path` in an API, e.g.
+
+```yaml
+- kind: api
+  name: my-api
+  model_path: s3://your-bucket/model.zip
+  compute:
+    replicas: 5
+    gpu: 1
+```

docs/applications/resources/apis.md

@@ -8,6 +8,7 @@ Serve models at scale and use them to build smarter applications.
 - kind: api  # (required)
   name: <string>  # API name (required)
   model_name: <string>  # name of a Cortex model (required)
+  model_path: <string>  # path to a zipped model dir (optional)
   compute:
     replicas: <int>  # number of replicas to launch (default: 1)
     cpu: <string>  # CPU request (default: Null)

docs/summary.md

@@ -38,6 +38,7 @@
   * [Compute](applications/advanced/compute.md)
   * [Python Packages](applications/advanced/python-packages.md)
   * [Development](development.md)
+  * [Importing External Models](applications/advanced/external-models.md)
 
 ## Operator
 

examples/external-model/app.yaml

@@ -0,0 +1,8 @@
+- kind: app
+  name: iris
+
+- kind: api
+  name: iris
+  model_path: s3://cortex-examples/iris-model.zip
+  compute:
+    replicas: 1

examples/external-model/samples.json

@@ -0,0 +1,10 @@
+{
+  "samples": [
+    {
+      "sepal_length": 5.2,
+      "sepal_width": 3.6,
+      "petal_length": 1.4,
+      "petal_width": 0.3
+    }
+  ]
+}

pkg/lib/aws/errors.go

@@ -29,12 +29,14 @@ type ErrorKind int
 const (
 	ErrUnknown ErrorKind = iota
 	ErrInvalidS3aPath
+	ErrInvalidS3Path
 	ErrAuth
 )
 
 var errorKinds = []string{
 	"err_unknown",
 	"err_invalid_s3a_path",
+	"err_invalid_s3_path",
 	"err_auth",
 }
 
@@ -105,7 +107,14 @@ func (e Error) Error() string {
 func ErrorInvalidS3aPath(provided string) error {
 	return Error{
 		Kind:    ErrInvalidS3aPath,
-		message: fmt.Sprintf("%s is not a valid s3a path", s.UserStr(provided)),
+		message: fmt.Sprintf("%s is not a valid s3a path (e.g. s3a://cortex-examples/iris.csv is a valid s3a path)", s.UserStr(provided)),
+	}
+}
+
+func ErrorInvalidS3Path(provided string) error {
+	return Error{
+		Kind:    ErrInvalidS3Path,
+		message: fmt.Sprintf("%s is not a valid s3 path (e.g. s3://cortex-examples/iris-model.zip is a valid s3 path)", s.UserStr(provided)),
 	}
 }
 

pkg/lib/aws/s3.go

@@ -233,6 +233,20 @@ func (c *Client) DeleteFromS3ByPrefix(prefix string, continueIfFailure bool) err
 	return errors.Wrap(err, prefix)
 }
 
+func IsValidS3Path(s3Path string) bool {
+	if !strings.HasPrefix(s3Path, "s3://") {
+		return false
+	}
+	parts := strings.Split(s3Path[5:], "/")
+	if len(parts) < 2 {
+		return false
+	}
+	if parts[0] == "" || parts[1] == "" {
+		return false
+	}
+	return true
+}
+
 func IsValidS3aPath(s3aPath string) bool {
 	if !strings.HasPrefix(s3aPath, "s3a://") {
 		return false

pkg/lib/configreader/float32_ptr.go

@@ -33,7 +33,7 @@ type Float32PtrValidation struct {
 	GreaterThanOrEqualTo *float32
 	LessThan             *float32
 	LessThanOrEqualTo    *float32
-	Validator            func(*float32) (*float32, error)
+	Validator            func(float32) (float32, error)
 }
 
 func makeFloat32ValValidation(v *Float32PtrValidation) *Float32Validation {
@@ -171,8 +171,17 @@ func validateFloat32Ptr(val *float32, v *Float32PtrValidation) (*float32, error)
 		}
 	}
 
+	if val == nil {
+		return val, nil
+	}
+
 	if v.Validator != nil {
-		return v.Validator(val)
+		validated, err := v.Validator(*val)
+		if err != nil {
+			return nil, err
+		}
+		return &validated, nil
 	}
+
 	return val, nil
 }

pkg/lib/configreader/float64_ptr.go

@@ -33,7 +33,7 @@ type Float64PtrValidation struct {
 	GreaterThanOrEqualTo *float64
 	LessThan             *float64
 	LessThanOrEqualTo    *float64
-	Validator            func(*float64) (*float64, error)
+	Validator            func(float64) (float64, error)
 }
 
 func makeFloat64ValValidation(v *Float64PtrValidation) *Float64Validation {
@@ -171,8 +171,17 @@ func validateFloat64Ptr(val *float64, v *Float64PtrValidation) (*float64, error)
 		}
 	}
 
+	if val == nil {
+		return val, nil
+	}
+
 	if v.Validator != nil {
-		return v.Validator(val)
+		validated, err := v.Validator(*val)
+		if err != nil {
+			return nil, err
+		}
+		return &validated, nil
 	}
+
 	return val, nil
 }

pkg/lib/configreader/int32_ptr.go

@@ -33,7 +33,7 @@ type Int32PtrValidation struct {
 	GreaterThanOrEqualTo *int32
 	LessThan             *int32
 	LessThanOrEqualTo    *int32
-	Validator            func(*int32) (*int32, error)
+	Validator            func(int32) (int32, error)
 }
 
 func makeInt32ValValidation(v *Int32PtrValidation) *Int32Validation {
@@ -171,8 +171,17 @@ func validateInt32Ptr(val *int32, v *Int32PtrValidation) (*int32, error) {
 		}
 	}
 
+	if val == nil {
+		return val, nil
+	}
+
 	if v.Validator != nil {
-		return v.Validator(val)
+		validated, err := v.Validator(*val)
+		if err != nil {
+			return nil, err
+		}
+		return &validated, nil
 	}
+
 	return val, nil
 }

pkg/lib/configreader/int64_ptr.go

@@ -33,7 +33,7 @@ type Int64PtrValidation struct {
 	GreaterThanOrEqualTo *int64
 	LessThan             *int64
 	LessThanOrEqualTo    *int64
-	Validator            func(*int64) (*int64, error)
+	Validator            func(int64) (int64, error)
 }
 
 func makeInt64ValValidation(v *Int64PtrValidation) *Int64Validation {
@@ -171,8 +171,17 @@ func validateInt64Ptr(val *int64, v *Int64PtrValidation) (*int64, error) {
 		}
 	}
 
+	if val == nil {
+		return val, nil
+	}
+
 	if v.Validator != nil {
-		return v.Validator(val)
+		validated, err := v.Validator(*val)
+		if err != nil {
+			return nil, err
+		}
+		return &validated, nil
 	}
+
 	return val, nil
 }

pkg/lib/configreader/int_ptr.go

@@ -33,7 +33,7 @@ type IntPtrValidation struct {
 	GreaterThanOrEqualTo *int
 	LessThan             *int
 	LessThanOrEqualTo    *int
-	Validator            func(*int) (*int, error)
+	Validator            func(int) (int, error)
 }
 
 func makeIntValValidation(v *IntPtrValidation) *IntValidation {
@@ -171,8 +171,17 @@ func validateIntPtr(val *int, v *IntPtrValidation) (*int, error) {
 		}
 	}
 
+	if val == nil {
+		return val, nil
+	}
+
 	if v.Validator != nil {
-		return v.Validator(val)
+		validated, err := v.Validator(*val)
+		if err != nil {
+			return nil, err
+		}
+		return &validated, nil
 	}
+
 	return val, nil
 }

pkg/lib/configreader/string_ptr.go

@@ -35,7 +35,7 @@ type StringPtrValidation struct {
 	DNS1123                       bool
 	AllowCortexResources          bool
 	RequireCortexResources        bool
-	Validator                     func(*string) (*string, error)
+	Validator                     func(string) (string, error)
 }
 
 func makeStringValValidation(v *StringPtrValidation) *StringValidation {
@@ -170,8 +170,17 @@ func validateStringPtr(val *string, v *StringPtrValidation) (*string, error) {
 		}
 	}
 
+	if val == nil {
+		return val, nil
+	}
+
 	if v.Validator != nil {
-		return v.Validator(val)
+		validated, err := v.Validator(*val)
+		if err != nil {
+			return nil, err
+		}
+		return &validated, nil
 	}
+
 	return val, nil
 }