add test images and dequantize for tensorflow model

app.py

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+import gradio as gr
+import os
+import platform
+from helper import CoreMLPipeline
+
+force_tf = os.environ.get('FORCE_TF', False)
+auth_key = os.environ.get('HF_TOKEN', True)
+
+config = { "coreml_extractor_repoid":"crossprism/efficientnetv2-21k-fv-m",
+           "coreml_extractor_path":"efficientnetV2M21kExtractor.mlmodel",
+           "tf_extractor_repoid":"crossprism/efficientnetv2-21k-fv-m-tf",
+           "tf_extractor_path":"efficientnetv2-21k-fv-m",
+           "coreml_classifier_repoid":"crossprism/travel_eu_landmarks",
+           "coreml_classifier_path":"LandmarksEUHead_quant8.mlpackage/Data/com.apple.CoreML/efficientnetV2M21kEULandmarksHead2_quant8.mlmodel",
+           "activation":"softmax"
+           }
+use_tf = force_tf or (platform.system() != 'Darwin')
+
+helper = CoreMLPipeline(config, auth_key, use_tf)
+
+def classify_image(image):
+    resized = image.resize((480,480))
+    return helper.classify(resized)
+
+image = gr.Image(type='pil')
+label = gr.Label(num_top_classes=3)
+
+gr.Interface(fn=classify_image, inputs=image, outputs=label, examples = [["test1.jpg"],["test2.jpg"],["test3.jpg"]]).launch()
+

helper.py

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+import tensorflow as tf
+import coremltools as ct
+import numpy as np
+import PIL
+from huggingface_hub import hf_hub_download
+from huggingface_hub import snapshot_download
+import os
+import math
+
+# Helper class to extract features from one model, and then feed those features into a classification head
+# Because coremltools will only perform inference on OSX, an alternative tensorflow inference pipeline uses
+# a tensorflow feature extractor and feeds the features into a dynamically created keras model based on the coreml classification head.
+class CoreMLPipeline:    
+    def __init__(self, config, auth_key, use_tf):
+        self.config = config
+        self.use_tf = use_tf
+        if use_tf:
+            extractor_path = snapshot_download(repo_id=config["tf_extractor_repoid"], use_auth_token  = auth_key)
+        else:
+            extractor_path = hf_hub_download(repo_id=config["coreml_extractor_repoid"],
+                                             filename=config["coreml_extractor_path"], use_auth_token  = auth_key)
+
+        classifier_path = hf_hub_download(repo_id=config["coreml_classifier_repoid"], filename=config["coreml_classifier_path"],
+                                          use_auth_token = auth_key)
+
+        print(f"Loading extractor...{extractor_path}")
+        if use_tf:
+            self.extractor = tf.saved_model.load(os.path.join(extractor_path, config["tf_extractor_path"]))
+        else:
+            self.extractor = ct.models.MLModel(extractor_path)
+
+        print(f"Loading classifier...{classifier_path}")
+        self.classifier = ct.models.MLModel(classifier_path)
+
+        if use_tf:
+            self.make_keras_model()
+
+    #unquantizes values if quantized
+    def realize_weights(self, nnWeights, width):
+        if nnWeights.quantization == 0:
+            weights = np.array(nnWeights.floatValue)
+        elif nnWeights.quantization.numberOfBits == 8:
+            scales = np.array(nnWeights.quantization.linearQuantization.scale)
+            biases = np.array(nnWeights.quantization.linearQuantization.bias)
+            quantized = nnWeights.rawValue
+            classes = len(scales)
+            weights = []
+            for i in range(0,classes):
+                scale = scales[i]
+                bias = biases[i]
+                for j in range(0,width):
+                    weights.append(quantized[i*width + j] * scale + bias)
+            weights = np.array(weights)
+        else:
+            print("Unsupported quantization")
+            weights = None
+        return weights
+
+    #Only MacOS can run inference on CoreML models. Convert it to tensorflow to match the tf feature extractor            
+    def make_keras_model(self):
+        spec = self.classifier.get_spec()
+        nnClassifier = spec.neuralNetworkClassifier
+        labels = nnClassifier.stringClassLabels.vector
+        input = tf.keras.Input(shape = (1280))
+        if "activation" in self.config:
+            activation = self.config['activation']
+        else:
+            activation = "sigmoid" if len(labels) == 1 else "softmax"
+        x = tf.keras.layers.Dense(len(labels), activation = activation)(input)
+        model = tf.keras.Model(input,x, trainable = False)
+        weights = self.realize_weights(nnClassifier.layers[0].innerProduct.weights,1280)  
+        weights = weights.reshape((len(labels),1280))
+        weights = weights.T
+
+        bias = self.realize_weights(nnClassifier.layers[0].innerProduct.bias, len(labels))
+        bias.reshape(1,len(labels))
+        model.set_weights([weights,bias])    
+        self.tf_model = model
+        self.labels = labels
+    import math
+    
+    def softmax_dict(self, input_dict):
+        """
+        Compute the softmax of a dictionary of values.
+        
+        Args:
+        input_dict (dict): A dictionary with numerical values.
+        
+        Returns:
+        dict: A dictionary with the same keys where the values are the softmax of the input values.
+        """
+        # Compute the exponential of all the values
+        exp_values = {k: math.exp(v) for k, v in input_dict.items()}
+        
+        # Compute the sum of all exponential values
+        sum_exp_values = sum(exp_values.values())
+        
+        # Compute the softmax by dividing each exponential value by the sum of all exponential values
+        softmax_values = {k: v / sum_exp_values for k, v in exp_values.items()}
+        
+        return softmax_values
+    
+
+    
+    def classify(self,resized):
+        if self.use_tf:
+            image = tf.image.convert_image_dtype(resized, tf.float32)
+            image = tf.expand_dims(image, 0)
+            features = self.extractor.signatures['serving_default'](image)
+            input = {"input_1":features["output_1"]}
+            output = self.tf_model.predict(input)
+            results = {}
+            for i,label in enumerate(self.labels):
+                results[label] = output[0][i]
+        else:
+            features = self.extractor.predict({"image":resized})
+            features = features["Identity"]
+            output = self.classifier.predict({"features":features[0]})
+            results = output["Identity"]
+            if "activation" in self.config and self.config["activation"] == "softmax":
+                results = self.softmax_dict(results)
+                
+        return results
+            

requirements.txt

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+coremltools==7.2
+tensorflow==2.15