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add gradient of MXNet operator batch_dot #175

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add gradient of MXNet operator batch_dot #175

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4 changes: 4 additions & 0 deletions minpy/array_variants/mxnet/mxnet_core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -112,6 +112,10 @@ def def_grads(prims):
prims('dot').def_grad(lambda ans, a, b: lambda g: mx.nd.dot(g, b, transpose_b=True))
prims('dot').def_grad(
lambda ans, a, b: lambda g: mx.nd.dot(a, g, transpose_a=True), argnum=1)
# batch_dot
prims('batch_dot').def_grad(lambda ans, a, b: lambda g: mx.nd.batch_dot(g, b, transpose_b=True))
prims('batch_dot').def_grad(
lambda ans, a, b: lambda g: mx.nd.batch_dot(a, g, transpose_a=True), argnum=1)
# non-linear
prims('tanh').def_grad(lambda ans, x: lambda g: g * (1 - ans ** 2))
prims('exp').def_grad(lambda ans, x: lambda g: g * ans)
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