pytorch

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## @package control_ops
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# Module caffe2.python.helpers.control_ops
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from caffe2.python.control_ops_util import add_if_op, add_while_op
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def cond(model, cond_blob, external_blobs, then_model, else_model=None):
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    """Condition"""
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    add_if_op(
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        model.net,
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        cond_blob,
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        external_blobs,
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        then_model.net,
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        else_model.net if else_model else None)
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def loop(model, cond_blob, external_blobs, loop_model, cond_model=None):
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    """Loop"""
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    add_while_op(
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        model.net,
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        cond_blob,
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        external_blobs,
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        loop_model.net,
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        cond_model.net if cond_model else None)
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