Merge pull request #3314 from djoshea/do_train_readin

lfads: Adding do_train_readin option allowing fixed readin matrices

research/lfads/lfads.py

@@ -365,7 +365,12 @@ class LFADS(object):
 
       if datasets and 'alignment_matrix_cxf' in datasets[name].keys():
         dataset = datasets[name]
-        print("Using alignment matrix provided for dataset:", name)
+        if hps.do_train_readin:
+            print("Initializing trainable readin matrix with alignment matrix" \
+                  " provided for dataset:", name)
+        else:
+            print("Setting non-trainable readin matrix to alignment matrix" \
+                  " provided for dataset:", name)
         in_mat_cxf = dataset['alignment_matrix_cxf'].astype(np.float32)
         if in_mat_cxf.shape != (data_dim, factors_dim):
           raise ValueError("""Alignment matrix must have dimensions %d x %d
@@ -374,7 +379,12 @@ class LFADS(object):
                             in_mat_cxf.shape[1]))
       if datasets and 'alignment_bias_c' in datasets[name].keys():
         dataset = datasets[name]
-        print("Using alignment bias provided for dataset:", name)
+        if hps.do_train_readin:
+          print("Initializing trainable readin bias with alignment bias " \
+                "provided for dataset:", name)
+        else:
+          print("Setting non-trainable readin bias to alignment bias " \
+                "provided for dataset:", name)
         align_bias_c = dataset['alignment_bias_c'].astype(np.float32)
         align_bias_1xc = np.expand_dims(align_bias_c, axis=0)
         if align_bias_1xc.shape[1] != data_dim:
@@ -387,12 +397,22 @@ class LFADS(object):
           # So b = -alignment_bias * W_in to accommodate PCA style offset.
           in_bias_1xf = -np.dot(align_bias_1xc, in_mat_cxf)
 
-      in_fac_lin = init_linear(data_dim, used_in_factors_dim, do_bias=True,
+      if hps.do_train_readin:
+          # only add to IO transformations collection only if we want it to be
+          # learnable, because IO_transformations collection will be trained
+          # when do_train_io_only
+          collections_readin=['IO_transformations']
+      else:
+          collections_readin=None
+
+      in_fac_lin = init_linear(data_dim, used_in_factors_dim,
+                               do_bias=True,
                                mat_init_value=in_mat_cxf,
                                bias_init_value=in_bias_1xf,
                                identity_if_possible=in_identity_if_poss,
                                normalized=False, name="x_2_infac_"+name,
-                               collections=['IO_transformations'])
+                               collections=collections_readin,
+                               trainable=hps.do_train_readin)
       in_fac_W, in_fac_b = in_fac_lin
       fns_in_fac_Ws[d] = makelambda(in_fac_W)
       fns_in_fac_bs[d] = makelambda(in_fac_b)
@@ -417,7 +437,7 @@ class LFADS(object):
         out_mat_fxc = None
         out_bias_1xc = None
         if in_mat_cxf is not None:
-          out_mat_fxc = np.linalg.pinv(in_mat_cxf)
+            out_mat_fxc = in_mat_cxf.T
         if align_bias_1xc is not None:
           out_bias_1xc = align_bias_1xc
 

research/lfads/run_lfads.py

@@ -23,6 +23,8 @@ import os
 import tensorflow as tf
 import re
 import utils
+import sys
+MAX_INT = sys.maxsize
 
 # Lots of hyperparameters, but most are pretty insensitive.  The
 # explanation of these hyperparameters is found below, in the flags
@@ -35,7 +37,7 @@ OUTPUT_FILENAME_STEM = ""
 DEVICE = "gpu:0" # "cpu:0", or other gpus, e.g. "gpu:1"
 MAX_CKPT_TO_KEEP = 5
 MAX_CKPT_TO_KEEP_LVE = 5
-PS_NEXAMPLES_TO_PROCESS = 1e8 # if larger than number of examples, process all
+PS_NEXAMPLES_TO_PROCESS = MAX_INT # if larger than number of examples, process all
 EXT_INPUT_DIM = 0
 IC_DIM = 64
 FACTORS_DIM = 50
@@ -53,6 +55,7 @@ INJECT_EXT_INPUT_TO_GEN = False
 DO_TRAIN_IO_ONLY = False
 DO_RESET_LEARNING_RATE = False
 FEEDBACK_FACTORS_OR_RATES = "factors"
+DO_TRAIN_READIN = True
 
 # Calibrated just above the average value for the rnn synthetic data.
 MAX_GRAD_NORM = 200.0
@@ -60,7 +63,7 @@ CELL_CLIP_VALUE = 5.0
 KEEP_PROB = 0.95
 TEMPORAL_SPIKE_JITTER_WIDTH = 0
 OUTPUT_DISTRIBUTION = 'poisson' # 'poisson' or 'gaussian'
-NUM_STEPS_FOR_GEN_IC = np.inf # set to num_steps if greater than num_steps
+NUM_STEPS_FOR_GEN_IC = MAX_INT # set to num_steps if greater than num_steps
 
 DATA_DIR = "/tmp/rnn_synth_data_v1.0/"
 DATA_FILENAME_STEM = "chaotic_rnn_inputs_g1p5"
@@ -316,6 +319,16 @@ flags.DEFINE_boolean("do_reset_learning_rate", DO_RESET_LEARNING_RATE,
                      "Reset the learning rate to initial value.")
 
 
+# for multi-session "stitching" models, the per-session readin matrices map from
+# neurons to input factors which are fed into the shared encoder. These are
+# initialized by alignment_matrix_cxf and alignment_bias_c in the input .h5
+# files. They can be fixed or made trainable.
+flags.DEFINE_boolean("do_train_readin", DO_TRAIN_READIN, "Whether to train the \
+                     readin matrices and bias vectors. False leaves them fixed \
+                     at their initial values specified by the alignment \
+                     matrices and vectors.")
+
+
 # OVERFITTING
 # Dropout is done on the input data, on controller inputs (from
 # encoder), on outputs from generator to factors.
@@ -429,7 +442,9 @@ def build_model(hps, kind="train", datasets=None):
                 "write_model_params"]:
       print("Possible error!!! You are running ", kind, " on a newly \
       initialized model!")
-      print("Are you sure you sure ", ckpt.model_checkpoint_path, " exists?")
+      # cant print ckpt.model_check_point path if no ckpt
+      print("Are you sure you sure a checkpoint in ", hps.lfads_save_dir,
+            " exists?")
 
     tf.global_variables_initializer().run()
 
@@ -536,6 +551,7 @@ def build_hyperparameter_dict(flags):
   d['cell_clip_value'] = flags.cell_clip_value
   d['do_train_io_only'] = flags.do_train_io_only
   d['do_reset_learning_rate'] = flags.do_reset_learning_rate
+  d['do_train_readin'] = flags.do_train_readin
 
   # Overfitting
   d['keep_prob'] = flags.keep_prob
@@ -775,4 +791,3 @@ def main(_):
 
 if __name__ == "__main__":
     tf.app.run()
- 

research/lfads/utils.py

@@ -84,14 +84,15 @@ def linear(x, out_size, do_bias=True, alpha=1.0, identity_if_possible=False,
 
 def init_linear(in_size, out_size, do_bias=True, mat_init_value=None,
                 bias_init_value=None, alpha=1.0, identity_if_possible=False,
-                normalized=False, name=None, collections=None):
+                normalized=False, name=None, collections=None, trainable=True):
   """Linear (affine) transformation, y = x W + b, for a variety of
   configurations.
 
   Args:
     in_size: The integer size of the non-batc input dimension. [(x),y]
     out_size: The integer size of non-batch output dimension. [x,(y)]
-    do_bias (optional): Add a learnable bias vector to the operation.
+    do_bias (optional): Add a (learnable) bias vector to the operation,
+      if false, b will be None
     mat_init_value (optional): numpy constant for matrix initialization, if None
       , do random, with additional parameters.
     alpha (optional): A multiplicative scaling for the weight initialization
@@ -131,21 +132,22 @@ def init_linear(in_size, out_size, do_bias=True, mat_init_value=None,
     if collections:
       w_collections += collections
     if mat_init_value is not None:
-      w = tf.Variable(mat_init_value, name=wname, collections=w_collections)
+      w = tf.Variable(mat_init_value, name=wname, collections=w_collections,
+                      trainable=trainable)
     else:
       w = tf.get_variable(wname, [in_size, out_size], initializer=mat_init,
-                          collections=w_collections)
+                          collections=w_collections, trainable=trainable)
     w = tf.nn.l2_normalize(w, dim=0) # x W, so xW_j = \sum_i x_bi W_ij
   else:
     w_collections = [tf.GraphKeys.GLOBAL_VARIABLES]
     if collections:
       w_collections += collections
     if mat_init_value is not None:
-      w = tf.Variable(mat_init_value, name=wname, collections=w_collections)
+      w = tf.Variable(mat_init_value, name=wname, collections=w_collections,
+                      trainable=trainable)
     else:
       w = tf.get_variable(wname, [in_size, out_size], initializer=mat_init,
-                          collections=w_collections)
-
+                          collections=w_collections, trainable=trainable)
   b = None
   if do_bias:
     b_collections = [tf.GraphKeys.GLOBAL_VARIABLES]
@@ -155,11 +157,12 @@ def init_linear(in_size, out_size, do_bias=True, mat_init_value=None,
     if bias_init_value is None:
       b = tf.get_variable(bname, [1, out_size],
                           initializer=tf.zeros_initializer(),
-                          collections=b_collections)
+                          collections=b_collections,
+                          trainable=trainable)
     else:
       b = tf.Variable(bias_init_value, name=bname,
-                      collections=b_collections)
-
+                      collections=b_collections,
+                      trainable=trainable)
 
   return (w, b)