Brainchip-Pneumonia - Classifier

Edge Impulse Experts / Brainchip-Pneumonia Public

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Target: BrainChip AKD1000 MINI PCIe Board

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import tensorflow as tf from tensorflow.keras.models import Sequential from tensorflow.keras.layers import Dense, InputLayer, Dropout, Conv1D, Conv2D, Flatten, Reshape, MaxPooling1D, MaxPooling2D, AveragePooling2D, BatchNormalization, Permute, ReLU, Softmax from tensorflow.keras.optimizers.legacy import Adam EPOCHS = args.epochs or 40 LEARNING_RATE = args.learning_rate or 0.0005 # If True, non-deterministic functions (e.g. shuffling batches) are not used. # This is False by default. ENSURE_DETERMINISM = args.ensure_determinism # this controls the batch size, or you can manipulate the tf.data.Dataset objects yourself BATCH_SIZE = args.batch_size or 32 if not ENSURE_DETERMINISM: train_dataset = train_dataset.shuffle(buffer_size=BATCH_SIZE*4) train_dataset=train_dataset.batch(BATCH_SIZE, drop_remainder=False) validation_dataset = validation_dataset.batch(BATCH_SIZE, drop_remainder=False) # model architecture model = Sequential() model.add(Conv2D(48, kernel_size=3, strides=2, kernel_constraint=tf.keras.constraints.MaxNorm(1), padding='same')) model.add(ReLU()) model.add(Conv2D(48, kernel_size=3, strides=2, kernel_constraint=tf.keras.constraints.MaxNorm(1), padding='same')) model.add(ReLU()) model.add(Flatten()) model.add(Dropout(0.35)) model.add(Dense(classes, name='y_pred')) model.add(Softmax()) # this controls the learning rate opt = Adam(learning_rate=LEARNING_RATE, beta_1=0.9, beta_2=0.999) callbacks.append(BatchLoggerCallback(BATCH_SIZE, train_sample_count, epochs=EPOCHS, ensure_determinism=ENSURE_DETERMINISM)) # train the neural network model.compile(loss='categorical_crossentropy', optimizer=opt, metrics=['accuracy']) model.fit(train_dataset, epochs=EPOCHS, validation_data=validation_dataset, verbose=2, callbacks=callbacks) import tensorflow as tf def akida_quantize_model( keras_model, weight_quantization: int = 4, activ_quantization: int = 4, input_weight_quantization: int = 8, ): import cnn2snn print("Performing post-training quantization...") akida_model = cnn2snn.quantize( keras_model, weight_quantization=weight_quantization, activ_quantization=activ_quantization, input_weight_quantization=input_weight_quantization, ) print("Performing post-training quantization OK") print("") return akida_model def akida_perform_qat( akida_model, train_dataset: tf.data.Dataset, validation_dataset: tf.data.Dataset, optimizer: str, fine_tune_loss: str, fine_tune_metrics: "list[str]", callbacks, stopping_metric: str = "val_accuracy", fit_verbose: int = 2, qat_epochs: int = 30, ): early_stopping = tf.keras.callbacks.EarlyStopping( monitor=stopping_metric, mode="max", verbose=1, min_delta=0, patience=10, restore_best_weights=True, ) callbacks.append(early_stopping) print("Running quantization-aware training...") akida_model.compile( optimizer=optimizer, loss=fine_tune_loss, metrics=fine_tune_metrics ) akida_model.fit( train_dataset, epochs=qat_epochs, verbose=fit_verbose, validation_data=validation_dataset, callbacks=callbacks, ) print("Running quantization-aware training OK") print("") return akida_model akida_model = akida_quantize_model(model) akida_model = akida_perform_qat( akida_model, train_dataset=train_dataset, validation_dataset=validation_dataset, optimizer=opt, fine_tune_loss='categorical_crossentropy', fine_tune_metrics=['accuracy'], callbacks=callbacks)

Input layer (307,200 features)

2D conv / pool layer (48 filters, 3 kernel size, 2 layers)

Flatten layer

Dropout (rate 0.35)

Output layer (2 classes)

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or can even bring your own model (in PyTorch, Keras or scikit-learn).

Layer type
Dense Fully connected layer, the simplest form of a neural network layer. Use this for processed data, such as the output of a spectral analysis DSP block.
1D Convolution / pooling Learn features that take spatial information into account along a single dimension. Use this for raw data, or for DSP blocks that output spatial data, such as the MFCC block.
2D Convolution / pooling Learn features that take spatial information into account along two dimensions. Use this for raw data, or for DSP blocks that output spatial data, such as the MFCC block.
Reshape Turn one-dimensional data from a DSP block into multi-dimensional data. Use this as an input to a convolutional layer. Use this for deep learning on raw data, or to process MFCC output.
Flatten Flatten multi-dimensional data into a single dimension. You need to flatten data from a convolutional layer before returning.
Dropout Reduce the risk of a model overfitting your dataset by randomly cutting a fraction of network connections during training. Can be helpful if your model's training performance is better than its validation performance.

Complete architectures

Model	Author
LGBM Random Forest Classifier Enterprise The LightGBM Random Forest Classifier is an efficient, gradient-boosting framework that builds multiple decision trees in parallel for robust and scalable classification tasks.	Edge Impulse Inc.
XGBoost Random Forest Classifier Enterprise The XGBoost Random Forest Classifier leverages the strengths of both gradient boosting and random forest methodologies to provide a powerful, efficient, and scalable solution for classification tasks.	Edge Impulse Inc.
SVM Classifier Enterprise The scikit-learn SVM classifier is a powerful algorithm that constructs a hyperplane or set of hyperplanes in a high-dimensional space for classification, effectively handling both linear and non-linear data.	Edge Impulse Inc.
Random Forest Classifier Enterprise The scikit-learn Random Forest Classifier is a versatile machine learning algorithm that builds multiple decision trees and merges their predictions for robust and accurate classification.	Edge Impulse Inc.
Logistic Regression Enterprise The scikit-learn Logistic Regressor is a linear model for classification that estimates probabilities using a logistic function, effectively handling binary and multiclass classification tasks.	Edge Impulse Inc.
Ridge Classifier Enterprise The scikit-learn Ridge classifier employs L2 regularization to optimize a linear classification model, mitigating overfitting by penalizing large coefficients, thereby enhancing model generalizability across diverse datasets.	Edge Impulse Inc.
RidgeCV Classifier Enterprise The scikit-learn RidgeCV classifier is a linear regression model with built-in cross-validation that applies ridge regularization to prevent overfitting and improve prediction accuracy.	Edge Impulse Inc.

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	Name
	David Tischler Edge Impulse staff

Neural Network settings

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Neural network architecture

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Dense

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LGBM Random Forest Classifier
Enterprise

XGBoost Random Forest Classifier
Enterprise

SVM Classifier
Enterprise

Random Forest Classifier
Enterprise

Logistic Regression
Enterprise

Ridge Classifier
Enterprise

RidgeCV Classifier
Enterprise

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Neural Network settings

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