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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def from_jgif(graph_jgif_dict):
 """Build a BEL graph from a JGIF JSON object. :param dict graph_jgif_dict: The JSON object representing the graph in JGIF format :rtype: BELGraph """

    graph = BELGraph()

    root = graph_jgif_dict['graph']

    if 'label' in root:
        graph.name = root['label']

    if 'metadata' in root:
        metadata = root['metadata']

        for key in METADATA_INSERT_KEYS:
            if key in metadata:
                graph.document[key] = metadata[key]

    parser = BELParser(graph)
    parser.bel_term.addParseAction(parser.handle_term)

    for node in root['nodes']:
        node_label = node.get('label')

        if node_label is None:
            log.warning('node missing label: %s', node)
            continue

        try:
            parser.bel_term.parseString(node_label)
        except NakedNameWarning as e:
            log.info('Naked name: %s', e)
        except ParseException:
            log.info('Parse exception for %s', node_label)

    for i, edge in enumerate(root['edges']):
        relation = edge.get('relation')
        if relation is None:
            log.warning('no relation for edge: %s', edge)

        if relation in {'actsIn', 'translocates'}:
            continue  # don't need legacy BEL format

        edge_metadata = edge.get('metadata')
        if edge_metadata is None:
            log.warning('no metadata for edge: %s', edge)
            continue

        bel_statement = edge.get('label')
        if bel_statement is None:
            log.debug('No BEL statement for edge %s', edge)

        evidences = edge_metadata.get('evidences')

        if relation in UNQUALIFIED_EDGES:
            pass  # FIXME?

        else:
            if not evidences:  # is none or is empty list
                log.debug('No evidence for edge %s', edge)
                continue

            for evidence in evidences:
                citation = evidence.get('citation')

                if not citation:
                    continue

                if 'type' not in citation or 'id' not in citation:
                    continue

                summary_text = evidence['summary_text'].strip()

                if not summary_text or summary_text == placeholder_evidence:
                    continue

                parser.control_parser.clear()
                parser.control_parser.citation = reformat_citation(citation)
                parser.control_parser.evidence = summary_text
                parser.control_parser.annotations.update(evidence[EXPERIMENT_CONTEXT])

                try:
                    parser.parseString(bel_statement, line_number=i)
                except Exception as e:
                    log.warning('JGIF relation parse error: %s for %s', e, bel_statement)

    return graph