add conf and pcsg class

conf.yaml

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+bf16: true
+data:
+  batch_size: 128
+  instr_ratio: 0.8
+  max_sample_length: 128
+  n_descriptive_properties: 4600
+  n_descriptive_values: 40
+  n_entities: 200
+  n_relative_properties: 1000
+  num_iters: 100000.0
+  num_of_classes_to_divide_over: 10
+  num_workers: 0
+  prior_param: 0.1
+  props_prior_type: structured_zeros
+deploy: true
+device: cuda
+epochs: 1
+eval:
+  cond_gen: false
+  grammar: true
+  llhood: true
+  reachable_pairs: true
+  save_tables: false
+  unscramble: true
+log:
+  eval_interval: 100
+  log_interval: 10
+  save_interval: 100
+  save_multiple: true
+model:
+  bias: false
+  compile: false
+  context_size: 256
+  dropout: 0.0
+  mlp: true
+  n_embd: 128
+  n_head: 2
+  n_layer: 2
+optimizer:
+  beta1: 0.9
+  beta2: 0.95
+  decay_lr: true
+  grad_clip: 1.0
+  learning_rate: 0.001
+  min_lr: 0.001
+  train_iters: 100000.0
+  warmup_iters: 200
+  weight_decay: 0.0001
+seed: 2
+tag: scratch

grammar/PCSG.pkl

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+version https://git-lfs.github.com/spec/v1
+oid sha256:249c708462953cf0da5e41d5f13766ccc042ef8c59ded7a370bf1ebdcad46331
+size 72174170