# Conceptual pseudo-code for adaptive mixed-precision assignment
def assign_bit_widths_adaptively(model, calibration_data, target_accuracy_drop):
    """
    Assigns bit-widths per layer based on sensitivity.
    This is a simplified conceptual approach.
    """
    layer_sensitivities = {}

    # 1. Evaluate baseline full-precision accuracy
    baseline_accuracy = evaluate_model(model, calibration_data)

    # 2. Iterate through layers to determine sensitivity
    for layer_name, layer in model.named_layers():
        # Temporarily quantize layer to a very low bit-width (e.g., 2-bit)
        # This is a proxy for maximum impact
        temp_quantized_model = quantize_layer_temporarily(model, layer_name, 2)
        temp_accuracy = evaluate_model(temp_quantized_model, calibration_data)
        layer_sensitivities[layer_name] = baseline_accuracy - temp_accuracy

    # 3. Sort layers by sensitivity and assign bit-widths
    sorted_layers = sorted(layer_sensitivities.items(), key=lambda item: item[1], reverse=True)

    assigned_bit_widths = {}
    for layer_name, _ in sorted_layers:
        # Start with a default lower bit-width, e.g., 1-bit or 0.5-bit
        # Gradually increase for more sensitive layers until target accuracy drop is met.
        current_bit_width = 1 # Or 0.5 for the most aggressive

        # This loop would involve iteratively trying different bit-widths
        # and re-evaluating, which is computationally expensive for a real system.
        # A more practical approach might use a pre-defined budget or a more complex heuristic.
        while current_bit_width < 4: # Assume max 4-bit for highly sensitive
            trial_model = assign_specific_bit_width(model, assigned_bit_widths, layer_name, current_bit_width)
            trial_accuracy = evaluate_model(trial_model, calibration_data)

            if (baseline_accuracy - trial_accuracy) < target_accuracy_drop:
                assigned_bit_widths[layer_name] = current_bit_width
                break
            current_bit_width += 1 # Or other discrete steps
        else: # If still too sensitive after trying all, assign highest allowed
            assigned_bit_widths[layer_name] = 4

    return assigned_bit_widths