code: def init():
      """Initialize global variables from flag values."""
      global CHR20_FASTA
      global HG001_CHR20_BAM
      global NA12891_CHR20_BAM
      global NA12892_CHR20_BAM
      global GOLDEN_TRAINING_EXAMPLES
      global GOLDEN_CANDIDATE_POSITIONS
      global GOLDEN_CALLING_CANDIDATES
      global GOLDEN_CALLING_EXAMPLES
      global CONFIDENT_REGIONS_BED
      global TRUTH_VARIANTS_VCF
      global TRUTH_VARIANTS_VCF_WITH_TYPES
      global GOLDEN_POSTPROCESS_INPUT
      global GOLDEN_POSTPROCESS_OUTPUT
      global GOLDEN_POSTPROCESS_OUTPUT_COMPRESSED
      global GOLDEN_POSTPROCESS_GVCF_INPUT
      global GOLDEN_POSTPROCESS_GVCF_OUTPUT
      global GOLDEN_POSTPROCESS_GVCF_OUTPUT_COMPRESSED
      global GOLDEN_MAKE_EXAMPLES_RUN_INFO
      global WS_ALLELE_COUNT_LINEAR_MODEL
      global WS_ALLELE_COUNT_LINEAR_MODEL_PCKL
      global WS_VARIANT_READS_THRESHOLD_MODEL
      global GOLDEN_VCF_CANDIDATE_IMPORTER_TRAINING_EXAMPLES
      global GOLDEN_VCF_CANDIDATE_IMPORTER_CALLING_EXAMPLES_CHILD
  
      global GRCH38_CHR0_FASTA
      global ONT_HG002_BAM
      global ONT_HG003_BAM
      global ONT_HG004_BAM
      global HG002_HIGH_CONFIDENCE_VCF
      global HG002_HIGH_CONFIDENCE_BED
      global HG002_DENOVO_BED
      global GOLDEN_ONT_MAKE_EXAMPLES_OUTPUT
      global GOLDEN_ONT_DENOVO_MAKE_EXAMPLES_OUTPUT
  
      CHR20_FASTA = deeptrio_testdata("input/hs37d5.chr20.fa.gz")
      HG001_CHR20_BAM = deeptrio_testdata(
          "input/HG001.chr20.10_10p1mb_sorted.bam"
      )
      NA12891_CHR20_BAM = deeptrio_testdata(
          "input/NA12891.chr20.10_10p1mb_sorted.bam"
      )
      NA12892_CHR20_BAM = deeptrio_testdata(
          "input/NA12892.chr20.10_10p1mb_sorted.bam"
      )
  
      GOLDEN_TRAINING_EXAMPLES = deeptrio_testdata(
          "golden.training_examples.tfrecord.gz"
      )
      GOLDEN_CANDIDATE_POSITIONS = deeptrio_testdata(
          "golden_child.candidate_positions"
      )
      GOLDEN_CALLING_CANDIDATES = deeptrio_testdata(
          "golden_child.calling_examples.tfrecord.gz"
      )
      GOLDEN_CALLING_EXAMPLES = deeptrio_testdata(
          "golden_child.calling_examples.tfrecord.gz"
      )
      CONFIDENT_REGIONS_BED = deeptrio_testdata(
          "input/test_giab.b37_chr20_100kbp_at_10mb.bed"
      )
      TRUTH_VARIANTS_VCF = deeptrio_testdata(
          "input/HG001_chr20_GRCh37_GIAB_highconf_CG-IllFB-IllGATKHC-Ion-10X-SOLID_CHROM1-X_v.3.3.2_highconf_PGandRTGphasetransfer.vcf.gz"
      )
      TRUTH_VARIANTS_VCF_WITH_TYPES = deeptrio_testdata(
          "input/with_types.test_nist.b37_chr20_4kbp_at_10mb.vcf.gz"
      )
      GOLDEN_POSTPROCESS_INPUT = deeptrio_testdata(
          "golden.postprocess_single_site_input.tfrecord.gz"
      )
      GOLDEN_POSTPROCESS_OUTPUT = deeptrio_testdata(
          "golden.postprocess_single_site_output.vcf"
      )
      GOLDEN_POSTPROCESS_OUTPUT_COMPRESSED = deeptrio_testdata(
          "golden.postprocess_single_site_output.vcf.gz"
      )
      GOLDEN_POSTPROCESS_GVCF_INPUT = deeptrio_testdata(
          "golden_child.postprocess_gvcf_input.tfrecord.gz"
      )
      GOLDEN_POSTPROCESS_GVCF_OUTPUT = deeptrio_testdata(
          "golden.postprocess_gvcf_output.g.vcf"
      )
      GOLDEN_MAKE_EXAMPLES_RUN_INFO = deeptrio_testdata(
          "golden.training_examples.tfrecord.gz.run_info.pbtxt"
      )
      WS_ALLELE_COUNT_LINEAR_MODEL = deeptrio_testdata(
          "window_selector_allele_count_linear.pbtxt"
      )
      WS_ALLELE_COUNT_LINEAR_MODEL_PCKL = deeptrio_testdata(
          "window_selector_allele_count_linear.pckl"
      )
      WS_VARIANT_READS_THRESHOLD_MODEL = deeptrio_testdata(
          "window_selector_variant_read_threshold.pbtxt"
      )
  
      # For oxford nanopore
      GRCH38_CHR0_FASTA = deeptrio_testdata(
          "input/grch38.chr20_5050000_5075000.masked.fa.gz"
      )
      ONT_HG002_BAM = deeptrio_testdata(
          "input/HG002_R10_chr20_5050000_5075000.bam"
      )
      ONT_HG003_BAM = deeptrio_testdata(
          "input/HG003_R10_chr20_5050000_5075000.bam"
      )
      ONT_HG004_BAM = deeptrio_testdata(
          "input/HG004_R10_chr20_5050000_5075000.bam"
      )
      HG002_HIGH_CONFIDENCE_VCF = deeptrio_testdata(
          "input/HG002_GRCh38_1_22_v4.2.1_benchmark.chr20.vcf.gz"
      )
      HG002_HIGH_CONFIDENCE_BED = deeptrio_testdata(
          "input/HG002_GRCh38_1_22_v4.2.1_benchmark.chr20.bed"
      )
      HG002_DENOVO_BED = deeptrio_testdata(
          "input/HG002_GRCh38_1_22_v4.2.1_benchmark.chr20.denovo_regions.bed"
      )
      GOLDEN_ONT_MAKE_EXAMPLES_OUTPUT = deeptrio_testdata(
          "HG002_ONT_deeptrio.examples.tfrecord.gz"
      )
      GOLDEN_ONT_DENOVO_MAKE_EXAMPLES_OUTPUT = deeptrio_testdata(
          "HG002_ONT_deeptrio.denovo.examples.tfrecord.gz"
      )
  
      # For CustomizedClassesVariantLabeler.
      global CUSTOMIZED_CLASSES_GOLDEN_TRAINING_EXAMPLES
      CUSTOMIZED_CLASSES_GOLDEN_TRAINING_EXAMPLES = deeptrio_testdata(
          "customized_classes.golden.training_examples.tfrecord.gz"
      )
  
      # For alt-aligned pileups
      global ALT_ALIGNED_PILEUP_GOLDEN_TRAINING_EXAMPLES
      ALT_ALIGNED_PILEUP_GOLDEN_TRAINING_EXAMPLES = deeptrio_testdata(
          "alt_aligned_pileup.golden.training_examples.tfrecord.gz"
      )
  
      GOLDEN_VCF_CANDIDATE_IMPORTER_TRAINING_EXAMPLES = deeptrio_testdata(
          "golden.vcf_candidate_importer.training_examples.tfrecord.gz"
      )
      GOLDEN_VCF_CANDIDATE_IMPORTER_CALLING_EXAMPLES_CHILD = deeptrio_testdata(
          "golden_child.vcf_candidate_importer.calling_examples.tfrecord.gz"
      )
  
label_desc: Use image node_id 2 for calling a global function with example usage: init() without return types