Backward.zero_grad: def of bendtorch-core@0.1.0.0
Import: import bendtorch-core@0.1.0.0/src/autograd/backward.bend as Backward
Lines 253-256 of bendtorch-core@0.1.0.0/src/autograd/backward.bend: https://jend.leeeet.dev/read.txt?path=bendtorch-core@0.1.0.0/src/autograd/backward.bend&start_line=253&end_line=256

import Base

# Empties every gradient slot, like PyTorch's zero_grad(set_to_none=True).
def zero_grad(tape: Tape) -> Tape:
  Tape{entries} = tape
  Tape{cleared(entries)}

Uses (2):
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/autograd/backward.bend&name=Tape
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/autograd/backward.bend&name=cleared