INNER CODE UNIT · Python

exists

lucidrains/vector-quantize-pytorch · vector_quantize_pytorch/binary_mapper.py:20

def exists(v):
    return v is not None

def default(v, d):
    return v if exists(v) else d

# tensor helpers

def binary_entropy(logits):
    prob = logits.sigmoid()
    not_prob = 1. - prob
    return -(prob * F.logsigmoid(logits) + not_prob * F.logsigmoid(-logits)).sum(dim = -1)

def pack_with_inverse(t, pattern):
    packed, ps = pack([t], pattern)

    def inverse(out, inv_pattern = None):
        inv_pattern = default(inv_pattern, pattern)

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