def METHOD_NAME(input_file, output_file, rewrite_rules):
    rules = rewrite_rules or []
    lines = []
    with open(input_file, 'r') as f:
        while True:
            line = f.readline()
            if not line:
                break
            # Apply rewrite rules to the line.
            for rule in rules:
                line = rule(line)
            # Remove ignored lines.
            if not any(l in line for l in IGNORE_LINES):
                lines.append(line)
    # Add Katib APIs to the init file.
    if (output_file == "sdk/python/v1beta1/kubeflow/katib/__init__.py"):
        lines.append("# Import Katib API client.\n")
        lines.append("from kubeflow.katib.api.katib_client import KatibClient\n")
        lines.append("# Import Katib helper functions.\n")
        lines.append("import kubeflow.katib.api.search as search\n")
        lines.append("# Import Katib helper constants.\n")
        lines.append("from kubeflow.katib.constants.constants import BASE_IMAGE_TENSORFLOW\n")
        lines.append("from kubeflow.katib.constants.constants import BASE_IMAGE_TENSORFLOW_GPU\n")
        lines.append("from kubeflow.katib.constants.constants import BASE_IMAGE_PYTORCH\n")
        lines.append("from kubeflow.katib.constants.constants import BASE_IMAGE_MXNET\n")
    # Add Kubernetes models to proper deserialization of Katib models.
    if (output_file == "sdk/python/v1beta1/kubeflow/katib/models/__init__.py"):
        lines.append("\n")
        lines.append("# Import Kubernetes models.\n")
        lines.append("from kubernetes.client import *\n")
    with open(output_file, 'w') as f:
        f.writelines(lines)