Table 4 Patent document vector obtained by using Doc2vec.

From: Tracking the dynamic evolution of lithium-ion battery recycling technology using natural language processing

Patent number

a1

a2

a3

a4

a5

1

−0.042669144

0.063143574

0.016211201

0.044042308

−0.052710813

2

0.00255396

0.004743763

−0.028248124

0.023439014

−0.051944137

3

−0.142936096

0.007243645

−0.034725886

0.067645222

−0.196120769

4

−0.111493982

0.062824421

0.010032888

0.118899442

−0.214586511

5

−0.157506227

0.119268626

0.064150125

0.120390281

−0.199777901

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